Add ability to manually run npm-audit-fix workflow (#313)

Author: ElizabethSamuel-MSFT

.github/workflows/autorun-npm-audit-fix.yml

@@ -3,6 +3,7 @@ run-name: Automatically run npm audit fix
 on:
   schedule:
     - cron: '45 08 1 * *' # Run at 1:45 AM PDT on the 1st of every month
+  workflow_dispatch:
 jobs:
   autorun-npm-audit-fix:
     runs-on: ubuntu-latest