build(deps): bump actions/checkout from 5.0.0 to 6.0.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@08c6903...1af3b93)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/check-formatting.yml

@@ -31,7 +31,7 @@ jobs:
             race: ""
 
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3
       - uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00
         with:
           go-version: ${{ matrix.go-version }}

.github/workflows/exercise-tests.yml

@@ -32,7 +32,7 @@ jobs:
 
     steps:
       - run: git config --global core.autocrlf false
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3
 
       - uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00
         with:

.github/workflows/gomod-sync.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-24.04
 
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3
 
       - uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00
         with:

.github/workflows/stub-tests.yml

@@ -31,7 +31,7 @@ jobs:
             race: ""
 
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3
       - uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00
         with:
           go-version: ${{ matrix.go-version }}