Bump actions/checkout from 6 to 7 (#84)

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/pr_validation.yaml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           lfs: true
           fetch-depth: 0

.github/workflows/publish_nuget.yml

@@ -15,7 +15,7 @@ jobs:
         os: [ubuntu-latest]
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v5
       with: