🔼 Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -25,7 +25,7 @@ jobs:
         shell: bash
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Restore dependencies
         run: dotnet restore

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Restore dependencies
         run: dotnet restore