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

can you merge master and ping on green (the precommit checks are failing) Thanks @vrsh - looks like there's some pre-commit failures, can you fix them up?
```
pre-commit run --files <files you committed>
``` Okay @MarcoGorelli and @jreback , I will take a look at the pre-commit checks and work on it Could you fixing the merge conflict, @vrsh?  @mroeschke Done Did you resolve the conflicts right? It now shows 0 files changed Yes @MacroGorelli the changes were done as part of commit d02348c4.

I guess someone else's PR on these files were accepted prior to mine hence closing this PR.

If this is not the case then please let me know how I can work on this further. @vrsh sorry about that - lots of other open issues if you still want to contribute though No problemo. I understand.
Looking forward to contribute on other pandas issues. 
@MarcoGorelli See you on another PR!