build(deps): 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/codeql-analysis.yml

@@ -22,7 +22,7 @@ jobs:
         language: [ 'csharp' ]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Setup .NET
       uses: actions/[email protected]

.github/workflows/continuous-integration.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Setup .NET
       uses: actions/[email protected]
@@ -59,7 +59,7 @@ jobs:
         runtime: [ linux-x64, linux-arm64, linux-arm ]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Setup .NET
       uses: actions/[email protected]
@@ -103,7 +103,7 @@ jobs:
         runtime: [ osx-x64, osx-arm64 ]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Setup .NET
       uses: actions/[email protected]

.github/workflows/lint-docs.yml

@@ -18,7 +18,7 @@ jobs:
     name: Lint markdown files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: DavidAnson/markdownlint-cli2-action@30a0e04f1870d58f8d717450cc6134995f993c63
         with:
@@ -30,7 +30,7 @@ jobs:
     name: Check for broken links
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Run link checker
         # For any troubleshooting, see:

.github/workflows/validate-install-from-source.yml

@@ -41,7 +41,7 @@ jobs:
             GNUPGHOME=/root/.gnupg tdnf install tar -y # needed for `actions/checkout`
           fi
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - run: |
           sh "${GITHUB_WORKSPACE}/src/linux/Packaging.Linux/install-from-source.sh" -y