ci: diable automatic dependency review workflow

Signed-off-by: Shubham Bhardwaj <shubbhar@redhat.com>

Author: infernus01

.github/workflows/dependency-review.yaml

@@ -8,8 +8,7 @@
 # Source repository: https://github.com/actions/dependency-review-action
 name: 'Dependency Review'
 'on':
-  pull_request: {}
-  merge_group: {}
+  workflow_dispatch: {}
 
 permissions:
   contents: read