chore: Add manual kickoff option to notify dependents workflow (#36)

Closes: #47

Updating the notify-dependents workflow to allow it to be kicked off
manually.

.github/workflows/notify-dependents.yml

@@ -1,5 +1,6 @@
 name: Notify Dependents
 on:
+    workflow_dispatch:
     push:
         branches:
             - main
@@ -11,4 +12,4 @@ jobs:
 
           - name: Notify Analyzer
             run: |
-                curl -X POST 'https://api.github.com/repos/dequelabs/axe-devtools-mobile-analyzer/actions/workflows/publish_latest.yml/dispatches' -H 'Content-Type: application/json' -H 'Authorization: Bearer ${{ secrets.CI_WORKFLOW_PAT }}' -d '{"ref": "main"}'
+                curl -X POST 'https://api.github.com/repos/dequelabs/axe-devtools-mobile-analyzer/actions/workflows/publish_latest.yml/dispatches' -H 'Content-Type: application/json' -H 'Authorization: Bearer ${{ secrets.CI_WORKFLOW_PAT }}' -d '{"ref": "main"}'