ci: explicitly specify global-json-file for actions/setup-dotnet@v4

Signed-off-by: Kenny Pflug <kenny.pflug@live.de>

Author: feO2x

.github/workflows/build-and-test.yml

@@ -14,6 +14,8 @@ jobs:
         uses: actions/checkout@v4
       - name: Set up .NET
         uses: actions/setup-dotnet@v4
+        with:
+          global-json-file: ./global.json
       - name: Cache NuGet packages
         uses: actions/cache@v4
         with: