chore: GitHub Actionsを最新メジャーバージョンに更新

actions/checkout v4→v6、actions/setup-node v4→v6、actions/upload-pages-artifact v3→v4に更新

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: yumechi

.github/workflows/deploy-test.yml

@@ -12,11 +12,11 @@ jobs:
     name: Test deployment
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v4
         with:
           version: latest
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 24
           cache: 'pnpm'

.github/workflows/deploy.yml

@@ -15,11 +15,11 @@ jobs:
     name: Deploy to GitHub Pages
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v4
         with:
           version: latest
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 24
           cache: 'pnpm'
@@ -29,7 +29,7 @@ jobs:
       - name: Build website
         run: pnpm build
 
-      - uses: actions/upload-pages-artifact@v3
+      - uses: actions/upload-pages-artifact@v4
         with:
           path: build