Update: Title game for 13.0 release (OpenTTD#10247)

Doc: Prepare for 13.0-beta2 release (OpenTTD#10149)

Remove: [Actions] Ubuntu Bionic and Debian Buster from release workfl…

…ow. (OpenTTD#10115)

Fix: [Actions] Remove Ubuntu:groovy from release pipeline (OpenTTD#9846)

It no longer exists upstream. Let's focus on LTS only for now.

Doc: Prepare for 12.1 release

Change: Title game for 12.0 release

Doc: Prepare for 12.0-RC1 release (OpenTTD#9574)

Doc: Prepare for 12.0-beta2 release (OpenTTD#9489)

Fix: [Actions] Ubuntu 18.04 by default has a compiler too old for Ope…

…nTTD (OpenTTD#9481)

Update: Changelog for 1.11.2 release