Generates and updates the sponsors.md list included below.

The list can be included directly by using the resolve file includes action and pointing the include to the sponsors.md or the convenient footer.md (as raw links).

To reuse this in your own fork, add a secret named GH_TOKEN that has permissions to query your sponsorships (via the GitHub CLI) and update files in your repository. The BOT_NAME and BOT_EMAIL repo/org secrets or variables can be used to set the committer name and email.