Upgrade action version

Author: znichollscr

.github/workflows/slash-command-dispatch.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Dispatch
-        uses: peter-evans/slash-command-dispatch@v2
+        uses: peter-evans/slash-command-dispatch@v5
         with:
           token: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
           issue-type: pull-request