build(deps): bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v5...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>

.github/workflows/main.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: "recursive"
           fetch-depth: 1
@@ -62,7 +62,7 @@ jobs:
         os: [ubuntu-22.04, ubuntu-22.04-arm]
     steps:
       - name: checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: "recursive"
           fetch-depth: 1
@@ -1312,7 +1312,7 @@ jobs:
             }
     steps:
       - name: checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: "recursive"
           fetch-depth: 1
@@ -1518,7 +1518,7 @@ jobs:
         image_name: ["linux-arm64", "web-wasm", "web-wasi", "web-wasi-threads"]
     steps:
       - name: checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: "recursive"
           fetch-depth: 1

.github/workflows/shellcheck.yml

@@ -18,7 +18,7 @@ jobs:
     name: Shellcheck
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Run ShellCheck
       uses: ludeeus/action-shellcheck@master
       with: