BUG: conda package for pandas and python37 on linux64 install wrong pandas-1.3.0-py39
- [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.

---

**Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports) detailing how to provide the necessary information for us to reproduce your bug.

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

On linux (debian)
```bash
conda create -n toto python=3.7 pandas
```

#### Problem description

Once executed the command above will install python37 but pandas for python39

```bash
root@86dbda50e2d0:~# conda create -n toto python=3.7 pandas
Collecting package metadata (current_repodata.json): done
Solving environment: done

## Package Plan ##

  environment location: /root/miniconda/envs/toto

  added / updated specs:
    - pandas
    - python=3.7


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    bottleneck-1.3.2           |   py37heb32a55_1         125 KB
    numexpr-2.7.3              |   py37h22e1b3c_1         188 KB
    pandas-1.3.0               |   py39h295c915_0         9.6 MB
    pip-21.1.3                 |   py37h06a4308_0         1.8 MB
    python-3.7.10              |       h12debd9_4        44.0 MB
    ------------------------------------------------------------
                                           Total:        55.6 MB

The following NEW packages will be INSTALLED:

  _libgcc_mutex      pkgs/main/linux-64::_libgcc_mutex-0.1-main
  _openmp_mutex      pkgs/main/linux-64::_openmp_mutex-4.5-1_gnu
  blas               pkgs/main/linux-64::blas-1.0-mkl
  bottleneck         pkgs/main/linux-64::bottleneck-1.3.2-py37heb32a55_1
  ca-certificates    pkgs/main/linux-64::ca-certificates-2021.7.5-h06a4308_1
  certifi            pkgs/main/linux-64::certifi-2021.5.30-py37h06a4308_0
  intel-openmp       pkgs/main/linux-64::intel-openmp-2021.3.0-h06a4308_3350
  ld_impl_linux-64   pkgs/main/linux-64::ld_impl_linux-64-2.35.1-h7274673_9
  libffi             pkgs/main/linux-64::libffi-3.3-he6710b0_2
  libgcc-ng          pkgs/main/linux-64::libgcc-ng-9.3.0-h5101ec6_17
  libgomp            pkgs/main/linux-64::libgomp-9.3.0-h5101ec6_17
  libstdcxx-ng       pkgs/main/linux-64::libstdcxx-ng-9.3.0-hd4cf53a_17
  mkl                pkgs/main/linux-64::mkl-2021.3.0-h06a4308_520
  mkl-service        pkgs/main/linux-64::mkl-service-2.4.0-py37h7f8727e_0
  mkl_fft            pkgs/main/linux-64::mkl_fft-1.3.0-py37h42c9631_2
  mkl_random         pkgs/main/linux-64::mkl_random-1.2.2-py37h51133e4_0
  ncurses            pkgs/main/linux-64::ncurses-6.2-he6710b0_1
  numexpr            pkgs/main/linux-64::numexpr-2.7.3-py37h22e1b3c_1
  numpy              pkgs/main/linux-64::numpy-1.20.3-py37hf144106_0
  numpy-base         pkgs/main/linux-64::numpy-base-1.20.3-py37h74d4b33_0
  openssl            pkgs/main/linux-64::openssl-1.1.1k-h27cfd23_0
  pandas             pkgs/main/linux-64::pandas-1.3.0-py39h295c915_0
  pip                pkgs/main/linux-64::pip-21.1.3-py37h06a4308_0
  python             pkgs/main/linux-64::python-3.7.10-h12debd9_4
  python-dateutil    pkgs/main/noarch::python-dateutil-2.8.2-pyhd3eb1b0_0
  pytz               pkgs/main/noarch::pytz-2021.1-pyhd3eb1b0_0
  readline           pkgs/main/linux-64::readline-8.1-h27cfd23_0
  setuptools         pkgs/main/linux-64::setuptools-52.0.0-py37h06a4308_0
  six                pkgs/main/noarch::six-1.16.0-pyhd3eb1b0_0
  sqlite             pkgs/main/linux-64::sqlite-3.36.0-hc218d9a_0
  tk                 pkgs/main/linux-64::tk-8.6.10-hbc83047_0
  wheel              pkgs/main/noarch::wheel-0.36.2-pyhd3eb1b0_0
  xz                 pkgs/main/linux-64::xz-5.2.5-h7b6447c_0
  zlib               pkgs/main/linux-64::zlib-1.2.11-h7b6447c_3


Proceed ([y]/n)? 
```

#### Expected Output

Install pandas-1.3.0-py37hxxxx instead

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

<details>

[paste the output of ``pd.show_versions()`` here leaving a blank line after the details tag]

</details>
