Merge branch 'renovate/onlyoffice-onlyoffice-nextcloud-7.x' into 'main'

Update dependency ONLYOFFICE/onlyoffice-nextcloud to v7.8.0

See merge request !515

values.yaml

@@ -74,7 +74,7 @@ apps:
     # Line order is important here for renovatebot! first github_repository,
     # then version
     github_repository: ONLYOFFICE/onlyoffice-nextcloud
-    version: v7.6.8
+    version: v7.8.0
     release_filename: onlyoffice.tar.gz
     enabled: true