Bump actions/checkout from 4 to 6 in /.github/workflows

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/ci.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: setup .net
         uses: actions/setup-dotnet@v5
@@ -38,7 +38,7 @@ jobs:
 
     steps:
       - name: checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: setup .net
         uses: actions/setup-dotnet@v5