Add Java 24 to CI test matrix (#678)

* Replace setup-scala with setup-java in snapshot workflow

Updates snapshot.yml to use actions/setup-java@v4 instead of olafurpg/setup-scala@v14 for better consistency with other workflows and official GitHub Actions.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Add Java 24 to CI test matrix

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: xerial

.github/workflows/test.yml

@@ -42,7 +42,7 @@ jobs:
   test-jdk:
     strategy:
       matrix:
-        version: [ '8', '11', '17', '21' ]
+        version: [ '8', '11', '17', '21', '24' ]
     name: test jdk${{ matrix.version }}
     needs: changes
     if: ${{ needs.changes.outputs.code == 'true' }}