upgrade testfixtures to v4.14.3
upgrade testfixtures to v4.14.3

wakatime/wakatime,wakatime/wakatime,wakatime/wakatime,wakatime/wakatime,wakatime/wakatime,wakatime/wakatime,wakatime/wakatime,wakatime/wakatime,wakatime/wakatime,wakatime/wakatime,wakatime/wakatime,wakatime/wakatime,wakatime/wakatime,wakatime/wakatime,wakatime/wakatime