bump gitea to 1.21.5

We use OCI charts from Bitnami, so this comment is no longer relevant

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/608
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.com>
Co-authored-by: yardenshoham <yardenshoham@noreply.gitea.com>
Co-committed-by: yardenshoham <yardenshoham@noreply.gitea.com>

Chart.yaml

@@ -3,7 +3,7 @@ name: gitea
 description: Gitea Helm chart for Kubernetes
 type: application
 version: 0.0.0
-appVersion: 1.21.4
+appVersion: 1.21.5
 icon: https://gitea.com/assets/img/logo.svg
 
 keywords:
@@ -31,7 +31,6 @@ maintainers:
   - name: Patrick Schratz
     email: patrick.schratz@gmail.com
 
-# Bitnami charts are served from GitHub CDN - See https://github.com/bitnami/charts/issues/10539 for details
 dependencies:
   # https://github.com/bitnami/charts/blob/main/bitnami/postgresql
   - name: postgresql