3.9
[3.9] gh-138744: GitHub Actions: pin to `windows-2022` (GH-138743) (GH-138758)
CODEOWNERS: Add Erlend Aasland as sqlite3 code owner (GH-92535)
bpo-33807: Add Python 3.7 buildbot link to '.github/CONTRIBUTING.rst' (GH-7532)
Add sponsorship details for GitHub Sponsor button (GH-14181)
bpo-33488: Satisfy markdownlint for the pull request template. (GH-6786)
Update link in SECURITY.md (GH-21320) (GH-26260)
Ignore NEWS snippets in code coverage stats (GH-18194)