bump to 1.21 and update maintainers

Chart.yaml

@@ -3,7 +3,7 @@ name: gitea
 description: Gitea Helm chart for Kubernetes
 type: application
 version: 0.0.0
-appVersion: 1.20.5
+appVersion: 1.21.0
 icon: https://gitea.com/assets/img/logo.svg
 
 keywords:
@@ -18,14 +18,8 @@ sources:
   - https://github.com/go-gitea/gitea
   - https://hub.docker.com/r/gitea/gitea/
 maintainers:
-  - name: Charlie Drage
-    email: charlie@charliedrage.com
   - name: Gitea Authors
     email: maintainers@gitea.io
-  - name: Konrad Lother
-    email: konrad.lother@novum-rgi.de
-  - name: Lucas Hahn
-    email: lucas.hahn@novum-rgi.de
   - name: Steven Kriegler
     email: sk.bunsenbrenner@gmail.com
   - name: Patrick Schratz