BUG: convert_dtypes ingoring convert keywords for pyarrow backend
- [ ] closes #xxxx (Replace xxxx with the GitHub issue number)
- [x] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [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.

cc @mroeschke 
This seems buggy, we should still respect the keywords
```
mypy.....................................................................Failed
- hook id: mypy
- duration: 163.23s
- exit code: 1

pandas/core/dtypes/cast.py:1110: error: Item "str" of "Union[str, Any, dtype[Any], ExtensionDtype]" has no attribute "kind"  [union-attr]
pandas/core/dtypes/cast.py:1111: error: Item "str" of "Union[str, Any, dtype[Any], ExtensionDtype]" has no attribute "kind"  [union-attr]
pandas/core/dtypes/cast.py:1112: error: Item "str" of "Union[str, Any, dtype[Any], ExtensionDtype]" has no attribute "kind"  [union-attr]
pandas/core/dtypes/cast.py:1115: error: Item "str" of "Union[str, Any, dtype[Any], ExtensionDtype]" has no attribute "kind"  [union-attr]
Found 4 errors in 1 file (checked 1417 source files)
``` thx fixed Merge conflict otherwise looks good