Geoscience Community Analysis Toolkit: GeoCAT-comp

• add custom season method by @jukent in https://github.com/NCAR/geocat-comp/pull/411 ### Bug Fixes
• Fix broken contributor's guide links by @kafitzgerald in https://github.com/NCAR/geocat-comp/pull/445
• Fix codecov coverage reports by @anissa111 in https://github.com/NCAR/geocat-comp/pull/446 ### Documentation
• Rephrase README.md by @anissa111 in https://github.com/NCAR/geocat-comp/pull/451
• Update description and fix PR links for v2023.09.0 by @anissa111 in https://github.com/NCAR/geocat-comp/pull/459
• Contributor's Guide by @anissa111 in https://github.com/NCAR/geocat-comp/pull/450 ### Misc
• Update release.md by @jukent in https://github.com/NCAR/geocat-comp/pull/434
• Bump pypa/gh-action-pypi-publish from 1.8.6 to 1.8.8 by @dependabot in https://github.com/NCAR/geocat-comp/pull/438
• Bump actions/setup-python from 4.6.1 to 4.7.0 by @dependabot in https://github.com/NCAR/geocat-comp/pull/437
• Include xarray pinning in setup.cfg by @anissa111 in https://github.com/NCAR/geocat-comp/pull/458

Full Changelog: https://github.com/NCAR/geocat-comp/compare/v2023.06.1...v2023.09.0