BUG: pandas.read_excel() - AttributeError: 'ElementTree' object has no attribute 'getiterator'
- [x] I have checked that this issue has not already been reported.

- [x] I have confirmed this bug exists on the latest version of pandas.

- [ ] (optional) I have confirmed this bug exists on the master branch of pandas.

---

#### Code Sample, a copy-pastable example

```python
pandas.read_excel("data.xlsx")

```

#### Problem description
Running the above code raises the exception below:

```
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-21-524fa4fa6612> in <module>
      1 path_prefix: str = "data/raw/"
----> 2 df = pandas.read_excel(f"{path_prefix}data.xlsx")

..lib/python3.9/site-packages/pandas/util/_decorators.py in wrapper(*args, **kwargs)
    294                 )
    295                 warnings.warn(msg, FutureWarning, stacklevel=stacklevel)
--> 296             return func(*args, **kwargs)
    297 
    298         return wrapper

..lib/python3.9/site-packages/pandas/io/excel/_base.py in read_excel(io, sheet_name, header, names, index_col, usecols, squeeze, dtype, engine, converters, true_values, false_values, skiprows, nrows, na_values, keep_default_na, na_filter, verbose, parse_dates, date_parser, thousands, comment, skipfooter, convert_float, mangle_dupe_cols)
    302 
    303     if not isinstance(io, ExcelFile):
--> 304         io = ExcelFile(io, engine=engine)
    305     elif engine and engine != io.engine:
    306         raise ValueError(

..lib/python3.9/site-packages/pandas/io/excel/_base.py in __init__(self, path_or_buffer, engine)
    865         self._io = stringify_path(path_or_buffer)
    866 
--> 867         self._reader = self._engines[engine](self._io)
    868 
    869     def __fspath__(self):

..lib/python3.9/site-packages/pandas/io/excel/_xlrd.py in __init__(self, filepath_or_buffer)
     20         err_msg = "Install xlrd >= 1.0.0 for Excel support"
     21         import_optional_dependency("xlrd", extra=err_msg)
---> 22         super().__init__(filepath_or_buffer)
     23 
     24     @property

..lib/python3.9/site-packages/pandas/io/excel/_base.py in __init__(self, filepath_or_buffer)
    351             self.book = self.load_workbook(filepath_or_buffer)
    352         elif isinstance(filepath_or_buffer, str):
--> 353             self.book = self.load_workbook(filepath_or_buffer)
    354         elif isinstance(filepath_or_buffer, bytes):
    355             self.book = self.load_workbook(BytesIO(filepath_or_buffer))

..lib/python3.9/site-packages/pandas/io/excel/_xlrd.py in load_workbook(self, filepath_or_buffer)
     35             return open_workbook(file_contents=data)
     36         else:
---> 37             return open_workbook(filepath_or_buffer)
     38 
     39     @property

..lib/python3.9/site-packages/xlrd/__init__.py in open_workbook(filename, logfile, verbosity, use_mmap, file_contents, encoding_override, formatting_info, on_demand, ragged_rows)
    128         if 'xl/workbook.xml' in component_names:
    129             from . import xlsx
--> 130             bk = xlsx.open_workbook_2007_xml(
    131                 zf,
    132                 component_names,

..lib/python3.9/site-packages/xlrd/xlsx.py in open_workbook_2007_xml(zf, component_names, logfile, verbosity, use_mmap, formatting_info, on_demand, ragged_rows)
    810     del zflo
    811     zflo = zf.open(component_names['xl/workbook.xml'])
--> 812     x12book.process_stream(zflo, 'Workbook')
    813     del zflo
    814     props_name = 'docprops/core.xml'

..lib/python3.9/site-packages/xlrd/xlsx.py in process_stream(self, stream, heading)
    264         self.tree = ET.parse(stream)
    265         getmethod = self.tag2meth.get
--> 266         for elem in self.tree.iter() if Element_has_iter else self.tree.getiterator():
    267             if self.verbosity >= 3:
    268                 self.dump_elem(elem)

AttributeError: 'ElementTree' object has no attribute 'getiterator'
```

#### Expected Output

`pandas.DataFrame`

#### Output of ``pd.show_versions()``

<details>

INSTALLED VERSIONS
------------------
commit           : 67a3d4241ab84419856b84fc3ebc9abcbe66c6b3
python           : 3.9.0.final.0
python-bits      : 64
OS               : Darwin
OS-release       : 19.6.0
Version          : Darwin Kernel Version 19.6.0: Thu Oct 29 22:56:45 PDT 2020; root:xnu-6153.141.2.2~1/RELEASE_X86_64
machine          : x86_64
processor        : i386
byteorder        : little
LC_ALL           : en_US.UTF-8
LANG             : en_US.UTF-8
LOCALE           : en_US.UTF-8

pandas           : 1.1.4
numpy            : 1.19.4
pytz             : 2020.4
dateutil         : 2.8.1
pip              : 20.2.3
setuptools       : 49.2.1
Cython           : None
pytest           : 6.1.2
hypothesis       : None
sphinx           : None
blosc            : None
feather          : None
xlsxwriter       : None
lxml.etree       : None
html5lib         : None
pymysql          : None
psycopg2         : None
jinja2           : 2.11.2
IPython          : 7.19.0
pandas_datareader: None
bs4              : None
bottleneck       : None
fsspec           : None
fastparquet      : None
gcsfs            : None
matplotlib       : 3.3.3
numexpr          : 2.7.1
odfpy            : None
openpyxl         : 3.0.5
pandas_gbq       : None
pyarrow          : None
pytables         : None
pyxlsb           : None
s3fs             : None
scipy            : 1.5.4
sqlalchemy       : None
tables           : 3.6.1
tabulate         : None
xarray           : None
xlrd             : 1.2.0
xlwt             : None
numba            : None

</details>
