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

Author: renovate[bot]

.github/workflows/dotnet-build.yml

@@ -18,7 +18,7 @@ jobs:
       arch: ${{ matrix.os == 'windows-2022' && 'x64' || (matrix.os == 'windows-11-arm' && 'arm64' || 'unknown') }}
     steps:
     - name: Checkout
-      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
       with:
         fetch-depth: 0
 
@@ -58,7 +58,7 @@ jobs:
       discussions: write
     steps:
       - name: Checkout repo
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
         with:
           fetch-depth: 0