chore(deps): update actions/checkout action to v6 (#185)

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

Author: renovate[bot]

.github/workflows/publish.yaml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     environment: release
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: actions/setup-node@v6

.github/workflows/tests.yaml

@@ -13,7 +13,7 @@ jobs:
   check-pre-commit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: "3.13"
@@ -22,7 +22,7 @@ jobs:
   check-attw:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: 22.21.x
@@ -37,7 +37,7 @@ jobs:
   test-coverage:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: 22.21.x
@@ -88,7 +88,7 @@ jobs:
           - node: "18"
             deps: [email protected]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: "${{ matrix.node }}"