Removing dict calls
- [ ] xref #38138 
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Removed the dict calls for the files:

`./pandas/core/arrays/floating.py`
`./pandas/core/arrays/numpy_.py`
`./pandas/core/arrays/interval.py`