chore: bump pylint version, dropping deprecated argparse.FileType lints (#6917)

Update pinned pylint versions to avoid false positives for
ProcessPoolExecutor, resolve any update pylint errors.

Resolve python 3.14 deprecated argparse.FileType by
converting --files param to str type, adapting extract_fns to use
expected file paths instead of filehandle.name during config file
processing.

This retains original behavior for multi-file config processing on
the CLI.