Merge pull request #26 from cachedjdk/gh-actions-set-output

CI: Fix use of deprecated set-output

Author: marktsuchida

.github/workflows/ci.yml

@@ -83,7 +83,7 @@ jobs:
         if: startsWith(github.ref, 'refs/tags/v')
         run: |
           VERSION="${GITHUB_REF##refs/tags/v}"
-          echo "::set-output name=version::${VERSION}"
+          echo "version=${VERSION}" >>$GITHUB_OUTPUT
       - name: Publish to gh-pages (tag)
         if: >-
           github.repository == 'cachedjdk/cjdk' &&