Update title

Author: MoteHue

.github/workflows/update-overcloud-host-image-tags.yml

@@ -46,7 +46,7 @@ jobs:
           branch: bump-overcloud-host-images-${{ inputs.rocky9_tag }}-${{ inputs.ubuntu_noble_tag }}
           delete-branch: true
           title: >-
-            DNM test PR: Bump overcloud host image tags 
+            Bump overcloud host image tags 
           body: |
             This PR was created automatically to update the overcloud host image
             tags.