chore(deps): bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/check-commits.yml

@@ -8,7 +8,7 @@ jobs:
     name: Block autosquash commits
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/dev.yml

@@ -16,7 +16,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: true
       - uses: actions/setup-node@v6
@@ -29,7 +29,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: true
       - uses: actions/setup-node@v6
@@ -53,7 +53,7 @@ jobs:
         node-version: [20, 22, 24]
     name: test node ${{ matrix.node-version }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: true
       - uses: actions/setup-node@v6
@@ -86,7 +86,7 @@ jobs:
         node-version: [20, 22, 24]
     name: test-integration node ${{ matrix.node-version }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: true
       - uses: actions/setup-node@v6
@@ -106,7 +106,7 @@ jobs:
           - demo/vercel/react/use-client-transport
     name: demo ${{ matrix.demo }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: true
       - uses: actions/setup-node@v6

.github/workflows/docs.yml

@@ -20,7 +20,7 @@ jobs:
       id-token: write
       contents: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: true
       - uses: actions/setup-node@v6

.github/workflows/publish.cdn.yml

@@ -12,7 +12,7 @@ jobs:
       id-token: write
       contents: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.ref }}
       - name: Configure AWS Credentials

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
       contents: 'write'
       id-token: 'write'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: true
       - uses: actions/setup-node@v6