try set output differently

.github/workflows/pull_request.yml

@@ -59,7 +59,7 @@ jobs:
         run: |
           semver=$(ruby echo_client_spec_version.rb)
           echo "Extracted semver: $semver"
-          echo "semver=$semver" >> $GITHUB_ENV
+          echo "::set-output name=semver::$semver"
       - name: Debug semver
         run: |
           echo "Semver is ${{ steps.get_semver.outputs.semver }}"