Bump actions/checkout from 5 to 6 (#8043)

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

.github/workflows/nuget-build.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       
       - name: Setup Python
         uses: actions/setup-python@v6
@@ -44,7 +44,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       
       - name: Setup Python
         uses: actions/setup-python@v6
@@ -68,7 +68,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       
       - name: Setup Python
         uses: actions/setup-python@v6
@@ -92,7 +92,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       
       - name: Setup Python
         uses: actions/setup-python@v6
@@ -113,7 +113,7 @@ jobs:
     runs-on: macos-13
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       
       - name: Setup Python
         uses: actions/setup-python@v6
@@ -134,7 +134,7 @@ jobs:
     runs-on: macos-13
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       
       - name: Setup Python
         uses: actions/setup-python@v6
@@ -157,7 +157,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       
       - name: Setup Python
         uses: actions/setup-python@v6
@@ -212,7 +212,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       
       - name: Setup Python
         uses: actions/setup-python@v6