Update Gitea version to 1.12.2 (#3)

Co-authored-by: lafriks <lafriks@noreply.gitea.io>
Co-authored-by: Matti R <matti@mdranta.net>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/3
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-by: 6543 <6543@noreply.gitea.io>

Chart.yaml

@@ -1,7 +1,7 @@
 name: gitea
 version: 1.3.3
 apiVersion: v2
-appVersion: 1.11.5
+appVersion: 1.12.2
 description: Git with a cup of tea
 icon: https://docs.gitea.io/images/gitea.png
 keywords:
@@ -17,3 +17,5 @@ sources:
 maintainers:
   - name: Charlie Drage
     email: charlie@charliedrage.com
+  - name: Gitea Authors
+    email: maintainers@gitea.io