2.6.20251216093331

What's Changed

• Remove support for Python 3.9 by @GlassOfWhiskey in #258
• Allow pytest 9 by @GlassOfWhiskey in #257

Deps

• Bump actions/setup-python from 5 to 6 by @dependabot[bot] in #250
• Bump mypy from 1.17.1 to 1.18.1 by @dependabot[bot] in #251
• Bump mypy from 1.18.1 to 1.18.2 by @dependabot[bot] in #252
• Update black requirement from ~=25.1 to ~=25.9 by @dependabot[bot] in #253
• Bump github/codeql-action from 3 to 4 by @dependabot[bot] in #255
• Update black requirement from ~=25.9 to ~=25.11 by @dependabot[bot] in #256
• Bump actions/checkout from 5 to 6 by @dependabot[bot] in #259
• Bump mypy from 1.18.2 to 1.19.0 by @dependabot[bot] in #260
• Update black requirement from ~=25.11 to ~=25.12 by @dependabot[bot] in #261
• Bump actions/cache from 4 to 5 by @dependabot[bot] in #262
• Bump mypy from 1.19.0 to 1.19.1 by @dependabot[bot] in #263

Full Changelog: 2.6.20250818005349...2.6.20251216093331