Update nginx Docker tag to v1.29.3 (#1897)

Author: Renovate Bot

clusters/cl01tl/applications/roundcube/values.yaml

@@ -58,7 +58,7 @@ roundcube:
         nginx:
           image:
             repository: nginx
-            tag: 1.29.2-alpine
+            tag: 1.29.3-alpine
             pullPolicy: IfNotPresent
           env:
             - name: NGINX_HOST