build(deps): Bump actions/checkout in the github-actions group

Bumps the github-actions group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `actions/checkout` from 3 to 6
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
     - name: Check out our repo
-      uses: actions/checkout@v3
+      uses: actions/checkout@v6
       with:
         submodules: true
 

.github/workflows/nuget.yml

@@ -13,7 +13,7 @@ jobs:
 
     steps:
     - name: Check out our repo
-      uses: actions/checkout@v3
+      uses: actions/checkout@v6
       with:
         submodules: true