CI: unpin pyarrow, fix failing test
- [x] closes #51146
- [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.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

Unpins pyarrow and fixes `test_from_sequence_of_strings_pa_array` which was xfailed for pyarrow duration types.

pyarrow 11.0 introduces support for casting from duration to string:

```
In [4]: pa.array([1], type=pa.duration("s")).cast(pa.string())
Out[4]: 
<pyarrow.lib.StringArray object at 0x7f77ed6cc9a0>
[
  "1"
]
```

pyarrow < 11.0 raises:
```
ArrowNotImplementedError: Unsupported cast from duration[s] to utf8 using function cast_string
```

Thanks @lukemanley  I guess we should add 11 to our build matrix? Good point. Otherwise 11 is only running on the macos and windows builds. Want to open a PR?