chore(deps): update actions/checkout action to v6 (#441)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/checks.yaml

@@ -19,7 +19,7 @@ jobs:
       matrix:
         node-version: [18.x, 20.x, 21.x]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
@@ -42,7 +42,7 @@ jobs:
     needs: preflight
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: latest
@@ -65,7 +65,7 @@ jobs:
     needs: preflight
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: latest
@@ -91,7 +91,7 @@ jobs:
       matrix:
         node-version: [18.x, 20.x, 21.x]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
@@ -121,7 +121,7 @@ jobs:
       matrix:
         node-version: [18.x, 20.x, 21.x]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}