Migrate away from set-output

.github/workflows/maven.yml

@@ -26,12 +26,12 @@ jobs:
     - name: Build with Maven
       run: mvn -B package --file pom.xml
     - name: Extract Maven project version
-      run: echo ::set-output name=version::$(mvn -q -Dexec.executable=echo -Dexec.args='${project.version}' --non-recursive exec:exec)
+      run: echo "bcv_version=$(mvn -q -Dexec.executable=echo -Dexec.args='${project.version}' --non-recursive exec:exec)" >> $GITHUB_ENV
       id: project
     - name: 'Upload Artifact'
       uses: actions/upload-artifact@v3
       if: ${{ matrix.java == '8' }}
       with:
-        name: Bytecode-Viewer-${{ steps.project.outputs.version }}-SNAPSHOT
-        path: target/Bytecode-Viewer-${{ steps.project.outputs.version }}.jar
+        name: Bytecode-Viewer-${{ env.bcv_version }}-SNAPSHOT
+        path: target/Bytecode-Viewer-${{ env.bcv_version }}.jar
         retention-days: 90