Update .NET restore command in build workflow

Author: sarul84

.github/workflows/build.yml

@@ -31,7 +31,7 @@ jobs:
       run: ls -R 
 
     - name: Restore dependencies
-      run: dotnet restore GraphqlClient/GraphqlHttpClient.csproj
+      run: dotnet restore PraKrish.GraphqlClient/Prakrishtha.GraphqlClient.sln
 
     - name: Build
       run: dotnet build ..\GraphqlHttpClient\GraphqlHttpClient --configuration Release --no-restore