Bump actions/checkout from 5 to 6

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](actions/checkout@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] <[email protected]>

Author: dependabot[bot]

.github/workflows/buildtest.yaml

@@ -8,7 +8,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macOS-latest]
     name: Dotnet build
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Setup dotnet
@@ -39,7 +39,7 @@ jobs:
     runs-on: windows-latest
     name: MSBuild build
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Add msbuild to PATH
@@ -56,7 +56,7 @@ jobs:
   e2e:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Setup dotnet

.github/workflows/codeql-analysis.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
           fetch-depth: 0
 

.github/workflows/docfx.yaml

@@ -25,7 +25,7 @@ jobs:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}    
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
 

.github/workflows/draft.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
 

.github/workflows/nuget.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0