build: Use the new github outputs format.

Author: JoshPiper

.github/workflows/build.yml

@@ -21,12 +21,12 @@ jobs:
         run: cp index.php index.orig.php && php build/builder.php
       - name: Check Changes
         id: change
-        run: (diff index.php index.orig.php && echo "::set-output name=changed::false") || echo "::set-output name=changed::true"
+        run: (diff index.php index.orig.php && echo "changed=false" >> "$GITHUB_OUTPUT") || echo "changed=true" >> "$GITHUB_OUTPUT"
       - name: Commit & Push
         if: steps.change.outputs.changed == 'true'
         run: |
          git config --global user.name 'Hints Builder'
          git config --global user.email 'internet@limelightgaming.net'
          git add "index.php"
          git commit -m "Updated index.php"
-         git push
+         git push