ci: dispatch miti99bot sync event after champions update

After a successful commit of champions.json, send a repository_dispatch
(type: loldle-data-updated) to tiennm99/miti99bot so its sync workflow
pulls the latest data into its loldle module. No-op when
MITI99BOT_DISPATCH_TOKEN is unset.

.github/workflows/update-champions.yml

@@ -25,10 +25,28 @@ jobs:
         run: go run .
 
       - name: Commit and push if changed
+        id: commit
         run: |
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"
           git add champions.json
-          git diff --cached --quiet && echo "No changes to commit" && exit 0
+          if git diff --cached --quiet; then
+            echo "No changes to commit"
+            echo "changed=false" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
           git commit -m "chore: update champions data to latest patch"
           git push
+          echo "changed=true" >> "$GITHUB_OUTPUT"
+
+      - name: Notify miti99bot
+        if: steps.commit.outputs.changed == 'true' && env.MITI99BOT_DISPATCH_TOKEN != ''
+        env:
+          MITI99BOT_DISPATCH_TOKEN: ${{ secrets.MITI99BOT_DISPATCH_TOKEN }}
+        run: |
+          curl -fsSL -X POST \
+            -H "Accept: application/vnd.github+json" \
+            -H "Authorization: Bearer $MITI99BOT_DISPATCH_TOKEN" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/tiennm99/miti99bot/dispatches \
+            -d '{"event_type":"loldle-data-updated","client_payload":{"source":"loldle-data","sha":"${{ github.sha }}"}}'