chore: update maintainers list - add ChristopherHX (#937)

As discussed in https://gitea.com/gitea/helm-gitea/issues/931

Reviewed-on: https://gitea.com/gitea/helm-gitea/pulls/937
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-by: Markus Pesch <volker.raschek@noreply.gitea.com>
Co-authored-by: ChristopherHX <christopher.homberger@web.de>
Co-committed-by: ChristopherHX <christopher.homberger@web.de>

CODEOWNERS

@@ -1 +1 @@
-* @rossigee @volker.raschek
+* @rossigee @volker.raschek @ChristopherHX

Chart.yaml

@@ -31,6 +31,10 @@ maintainers:
   - name: Daan Selen
     email: dselen@nerthus.nl
 
+  # https://gitea.com/ChristopherHX
+  - name: Christopher Homberger
+    email: christopher.homberger@web.de
+
 dependencies:
   # https://github.com/bitnami/charts/blob/main/bitnami/postgresql
   - name: postgresql