Log Message:
Update to 1.281

Upstream changes:
1.281   2024-12-27 14:44:47Z
        Summary:
        - Implement support for signatures and other parsing features
        Details:
        - Framework for recognition of parsing feature activation via:
          - `use $PERL_VERSION` in code
          - `use feature` in code
          - `use $Common::CPAN::Module` in code
          - PPI::Document->new( feature_mods => ... )
          - PPI::Document->new( custom_feature_includes => ... )
          - PPI::Document->new( custom_feature_include_cb => ... )
          - $ENV{PPI_CUSTOM_FEATURE_INCLUDES}
        - Added ability to parse features:
          - signatures, as PPI::Structure::Signature
          - try catch, as PPI::Statement::Compound