ci: disable NC master branch

Signed-off-by: Saw-jan <[email protected]>

Author: saw-jan

.github/workflows/shared_workflow.yml

@@ -10,7 +10,7 @@ on:
       nextcloud_versions:
         required: false
         type: string
-        default: "30 31 32 master"
+        default: "30 31 32"
       php_versions:
         required: false
         type: string