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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
         id: find-yarn-cache
         run: echo "::set-output name=dir::$(yarn cache dir)"
       - name: git checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Cache yarn dependencies
         uses: actions/cache@v4
         with:
@@ -40,7 +40,7 @@ jobs:
         id: find-yarn-cache
         run: echo "::set-output name=dir::$(yarn cache dir)"
       - name: git checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Cache yarn dependencies
         uses: actions/cache@v4
         with: