chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/ci.yml

@@ -5,11 +5,11 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           submodules: recursive
       - name: Repository lampy
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           submodules: recursive
           ref: 'v2.0'