update workflow to set output for version using new syntax

Author: rongxin-liu

.github/workflows/main.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Extract program version
         id: program_version
         run: |
-          echo ::set-output name=version::$(style50 --version | cut --delimiter ' ' --fields 2)
+          echo "version=$(style50 --version | cut --delimiter ' ' --fields 2)" >> $GITHUB_OUTPUT
 
       - name: Create Release
         if: ${{ github.ref == 'refs/heads/main' }}