These calls are preventing users to browse subversion/mercurial repositories in PHP 8.1+.
Indeed, a similar bug affecting git repositories was already addressed in another commit
(rP6b8ec50148909938850b5acfd11725ae23a8e31b). This commit harmonize both DiffusionSvnRequest
and DiffusionMercurialRequest with DiffusionGitRequest
Fix T15607