ci: Remove deprecated output from make-gen-delta

.github/workflows/make-gen-delta.yml

@@ -18,7 +18,7 @@ jobs:
         # version, because "goenv" can react to it automatically.
         run: |
           echo "Building with Go $(cat .go-version)"
-          echo "::set-output name=go-version::$(cat .go-version)"
+          echo "go-version=$(cat .go-version)" >> $GITHUB_OUTPUT
       - name: Set up Go
         uses: actions/setup-go@v3
         with: