chore(deps): Bump actions/checkout from 4 to 6

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/ConvertGuidelinesXmlToMarkdown.yml

@@ -15,7 +15,7 @@ jobs:
       XmlFileName: "Guidelines(8th Edition).xml"
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
           ref: ${{ github.ref }}
           token: ${{ secrets.CI_PAT }}

.github/workflows/Deploy.yml

@@ -13,7 +13,7 @@ jobs:
   build-and-test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v4

.github/workflows/copilot-setup-steps.yml

@@ -26,7 +26,7 @@ jobs:
     # If you do not check out your code, Copilot will do this for you.
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v4

.github/workflows/dotnetBuild.yml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     - name: Setup .NET
       uses: actions/setup-dotnet@v4

.github/workflows/manuallyRunXmlToMD.yml

@@ -19,7 +19,7 @@ jobs:
       XmlFileName: "Guidelines(8th Edition).xml"
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
           ref: ${{ github.ref }}
           token: ${{ secrets.CI_PAT }}