chore(deps): update actions/checkout action to v6 (#82)

Co-authored-by: lucca-renovate[bot] <136098540+lucca-renovate[bot]@users.noreply.github.com>

Author: lucca-renovate[bot]

.github/workflows/dotnetcore.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+    - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
     - run: git fetch --prune --unshallow
 
     - name: Setup .NET Core 8