backport fix for "set-output" step

Author: cowtowncoder

.github/workflows/main.yml

@@ -47,7 +47,7 @@ jobs:
       run: ./mvnw -B -q -ff -ntp -Dversion.kotlin=${{ matrix.kotlin_version }} verify
     - name: Extract project Maven version
       id: projectVersion
-      run: echo ::set-output name=version::$(./mvnw org.apache.maven.plugins:maven-help-plugin:3.2.0:evaluate -DforceStdout -Dexpression=project.version -q)
+      run: echo "version=$(./mvnw org.apache.maven.plugins:maven-help-plugin:3.2.0:evaluate -DforceStdout -Dexpression=project.version -q)" >> $GITHUB_OUTPUT
     - name: Deploy snapshot
       if: github.event_name != 'pull_request' && matrix.java_version == '8' && matrix.kotlin_version == '1.6.21' && endsWith(steps.projectVersion.outputs.version, '-SNAPSHOT')
       env: