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

Author: renovate[bot]

.github/workflows/main.yml

@@ -5,7 +5,7 @@ jobs:
     name: test / ${{matrix.os}} / ${{matrix.node}}
     runs-on: ${{matrix.os}}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: actions/setup-node@v4
@@ -30,7 +30,7 @@ jobs:
     name: full build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: actions/setup-node@v4

.github/workflows/website.yml

@@ -11,7 +11,7 @@ jobs:
     # <https://github.com/puppeteer/puppeteer/issues/12818>.
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v4
         with:
           node-version: node