dict rewritten as literal for files in directory /pandas/core/arrays/
- [x] xref #38138 
- [ ] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry: Identify unnecessary dict call - rewrite as a literal for directory /pandas/core/arrays/floating.py, interval.py, numpy_.py & base.py
