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/build.yaml

@@ -46,7 +46,7 @@ jobs:
 
     steps:
       - name: Checkout the code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # Need a full clone so that `git describe` reports the right version
           fetch-depth: 0
@@ -67,7 +67,7 @@ jobs:
 
     steps:
       - name: Checkout the code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - uses: ./.github/actions/build-frontend
       - uses: ./.github/actions/build-policies
@@ -112,7 +112,7 @@ jobs:
 
     steps:
       - name: Checkout the code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@stable
@@ -376,7 +376,7 @@ jobs:
 
     steps:
       - name: Checkout the code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           sparse-checkout: |
             .github/scripts
@@ -454,7 +454,7 @@ jobs:
 
     steps:
       - name: Checkout the code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           sparse-checkout: |
             .github/scripts