Update actions/checkout action to v5 (nhibernate#3690)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/GenerateAsyncCode.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
       with:
         ref: ${{ github.event.pull_request.head.ref }}
         repository: ${{ github.event.pull_request.head.repo.full_name }}

.github/workflows/NetCoreTests.yml

@@ -69,7 +69,7 @@ jobs:
         dotnet-version: 8.0.x
 
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         show-progress: false