This update includes a number of bugfixes. The changelog can be found
here: https://github.com/go-gitea/gitea/blob/v1.21.5/CHANGELOG.md.
There is a security fix for inappropriate access to non public container
images. We don't how private data and we don't use the container
registry in gitea so this doesn't affect us.
There are no changes to template files that we override.
Change-Id: I9419a22736de82e135a25fca22aef1ed10c19e1a
3fd045aec3