publish ワークフローに sbt/setup-sbt を追加

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: aiiro-claude[bot]

.github/workflows/publish.yml

@@ -17,7 +17,7 @@ jobs:
         with:
           distribution: temurin
           java-version: '21'
-          cache: sbt
+      - uses: sbt/setup-sbt@v1
       - name: Test
         run: sbt "+test"
       - name: Publish