Bump actions/checkout from 5 to 6 (#264)

Author: dependabot[bot]

.github/workflows/build-test.yml

@@ -30,7 +30,7 @@ jobs:
     steps:
     # uses GitHub's checkout action to checkout code form the master branch
     - name: 🛎️ Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Setup .NET 10.0
       uses: actions/setup-dotnet@v5

.github/workflows/codeql-analysis.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         # We must fetch at least the immediate parents so that if this is
         # a pull request then we can checkout the head.

.github/workflows/depcheck.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - name: 🛎️ Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: ⚙️ Setup .NET 10.0
         uses: actions/setup-dotnet@v5

.github/workflows/deploy-site.yml

@@ -35,7 +35,7 @@ jobs:
 #     if: ${{ github.event.workflow_run.conclusion == 'success' }}
     steps:
     # uses GitHub's checkout action to checkout code form the master branch
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Setup .NET 10.0
       uses: actions/setup-dotnet@v5