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] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
         working-directory: src
     steps:
       - name: "📥 Checkout repository"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: "🧰 Setup .NET"
         uses: actions/setup-dotnet@v5
@@ -74,7 +74,7 @@ jobs:
         working-directory: src
     steps:
       - name: "📥 Checkout repository"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: "🧰 Setup .NET"
         uses: actions/setup-dotnet@v5
@@ -159,7 +159,7 @@ jobs:
         working-directory: src
     steps:
       - name: "📥 Checkout repository"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: "🧰 Setup .NET"
         uses: actions/setup-dotnet@v5
@@ -198,7 +198,7 @@ jobs:
     if: github.event_name == 'push'
     steps:
       - name: "📥 Checkout repository"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/codeql-analysis.yml

@@ -32,7 +32,7 @@ jobs:
         language: ['csharp']
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: true
     - name: Setup .NET