Upgrade to release 2.15.0:
- Improve performance of module_imports_on_top_of_file.
- Improve performance of python_3000_invalid_escape_sequence.
- Improve performacne of missing_whitespace_after_keyword.
- Drop EOL python 3.9.
- Add support for python 3.15.
- Fix loading unrelated configuration due to commonprefix.
Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>
