Merge pull request #35608 from nextcloud/backport/35580/stable23

[stable23] downgrade ubuntu in order to fix CI

Author: szaimen

.github/workflows/s3-primary.yml

@@ -9,7 +9,7 @@ on:
 
 jobs:
   s3-primary-tests-minio:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     strategy:
       # do not stop on another job's failure