Bump xunit.runner.visualstudio from 2.5.1 to 2.5.3 in /framework/libraries/migrate-library-csproj-keep-existing/src/Car.Net45

Bump xunit.runner.visualstudio from 2.5.1 to 2.5.3 in /framework/libraries/migrate-library-csproj-keep-existing/src/Car.Net45 #243