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](actions/checkout@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] <[email protected]>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -31,7 +31,7 @@ jobs:
       ZIG_GLOBAL_CACHE_DIR: /zig/global-cache
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Setup Cache
       uses: namespacelabs/[email protected]
@@ -63,7 +63,7 @@ jobs:
       ZIG_GLOBAL_CACHE_DIR: /zig/global-cache
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Setup Cache
       uses: namespacelabs/[email protected]
@@ -97,7 +97,7 @@ jobs:
     runs-on: namespace-profile-mitchellh-sm-systemd
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     # Required by Namespace
     - run: sudo systemctl start ssh
@@ -122,7 +122,7 @@ jobs:
     runs-on: macos-latest
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Install zig
       uses: mlugg/setup-zig@v2
@@ -142,7 +142,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Install zig
       uses: mlugg/setup-zig@v2