Fix push tag workflow (#5082)

This commit fixes the `push-tag.yml` workflow to work with the new
`Cargo.toml` manifest since workspace inheritance was added. This
additionally fixes some warnings coming up on CI about our usage of
deprecated features on github actions.

.github/workflows/performance.yml

@@ -162,7 +162,7 @@ jobs:
             body="${body//'%'/'%25'}"
             body="${body//$'\n'/'%0A'}"
             body="${body//$'\r'/'%0D'}"
-            echo "::set-output name=body::$body"
+            echo "body=$body" >> $GITHUB_OUTPUT
 
       - name: Publish Results
         run: |