GH Actions: work around intermittent apt-get errors#48

wimg merged 1 commit intomasterPHPCompatibility/PHPCompatibilitySymfony:masterfrom

feature/ghactions-xmllint-bypass-apt-get-updatePHPCompatibility/PHPCompatibilitySymfony:feature/ghactions-xmllint-bypass-apt-get-updateCopy head branch name to clipboard