Bump version to 2.8.0 (mastodon#10550)

Bump version to 2.8.0rc3 (mastodon#10535)

Bump version to 2.8.0rc2 (mastodon#10501)

Bump version to 2.8.0rc1 (mastodon#10340)

Update AUTHORS.md
Update CHANGELOG.md

Bump version to 2.7.4

Bump version to 2.7.3

Bump version to 2.7.2

Bump version to 2.7.1 (mastodon#9932)

Fix multiple workers for the same scheduled status being queueable (m…

…astodon#9875)

Bump to 2.7.0rc3