gource has new releases

[oupala]

Gource has new releases 0.52 and 0.53 in 2022. Envisaged should be updated to these versions!

[Potherca]

I hate bumping issues, but it would be nice if 0.52 and/or 0.53 could be build and release to dockerhub!

/cc: @jamesbrink

[ManuelRauber]

@jamesbrink Also bumping here :/

[ManuelRauber]

Also pinging @tkharris and @mbedgar