Changelog for v1.11.8 and v1.12.1 (#12006) (#12007)

* Changelog for v1.12.1 (#12006)

* Update gitea version to latest release

docs/config.yaml

@@ -18,7 +18,7 @@ params:
   description: Git with a cup of tea
   author: The Gitea Authors
   website: https://docs.gitea.io
-  version: 1.12.0
+  version: 1.12.1
   minGoVersion: 1.12
   goVersion: 1.14
   minNodeVersion: 10.13