Update nginx Docker tag to v1.28.0

Author: renovate[bot]

charts/studio/values.yaml

@@ -952,7 +952,7 @@ studioPypiCache:
     # -- Image repository
     repository: nginx
     # -- Image tag
-    tag: 1.27.4-alpine
+    tag: 1.28.0-alpine
 
   service:
     port: 8080