BUG: Fix rounding of percentile 99.999% to 100%
- [x] closes #55765
- [x] [Tests added and passed]
- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [x] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [x] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

> Could you add a whatsnew note to `v2.2.0.rst`?

Sure. Added Thanks @parthi-siva 