feat(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
         node-version: [18.x, 20.x]
     steps:
       - name: git checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: yarn cache
         uses: actions/cache@v4
         with:
@@ -34,7 +34,7 @@ jobs:
     needs: build-and-test
     steps:
       - name: git checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: yarn cache
         uses: actions/cache@v4
         with: