ci: upgrade actions to Node 24 compatible versions

- actions/checkout: v4 → v6
- actions/setup-node: v4 → v6
- actions/upload-artifact: v4 → v5
- actions/checkout (codeql.yml): v4 → v6

https://claude.ai/code/session_019Jbz6HpQvWU1wpm5M6MZpd

.github/workflows/ci.yml

@@ -27,9 +27,9 @@ jobs:
     runs-on: ubuntu-latest
     if: github.ref != 'refs/heads/main' && github.ref != 'refs/heads/master'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: '22'
           cache: 'npm'
@@ -45,7 +45,7 @@ jobs:
           SHA=$(echo "${{ github.sha }}" | cut -c1-7)
           echo "name=plugin-${BRANCH}-${SHA}" >> $GITHUB_OUTPUT
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         with:
           name: ${{ steps.artifact.outputs.name }}
           path: |

.github/workflows/codeql.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v4