Fix github action

Author: AlexSatsukevich

.github/workflows/run-smoke-test.yml

@@ -17,7 +17,7 @@ jobs:
         with:
           dotnet-version: '6.0.x'
       - run: dotnet build src/Regula.DocumentReader.NetCoreExample -c Release
-      - working-directory: src/Regula.DocumentReader.NetCoreExample/bin/Release/netcoreapp3.1/
+      - working-directory: src/Regula.DocumentReader.NetCoreExample/bin/Release/net6.0/
         run: ./Regula.DocumentReader.NetCoreExample
         env:
           API_BASE_PATH: "https://test-api.regulaforensics.com"