Update update-dotnet-install-script.yml which updates vendor dotnet script for oryx (#938)

Update update-dotnet-install-script.yml

Author: samruddhikhandale

.github/workflows/update-dotnet-install-script.yml

@@ -39,7 +39,7 @@ jobs:
 
           # Add / update and commit
           git add src/dotnet/scripts/vendor/dotnet-install.sh
-          git add src/dotnet/scripts/vendor/dotnet-install.sh
+          git add src/oryx/scripts/vendor/dotnet-install.sh
 
           git commit -m 'Automated dotnet-install script update' || export NO_UPDATES=true