typing: fix a syntax error in mercurial/cext/bdiff.pyi I noticed because `merge-pyi` on the non-cext implementations with this file as input skipped the return type for this. `pytype-single --parse-pyi` confirmed it was a problem.

hg-core: relax dependencies pinning Being this rigid makes packagers' job more difficult since they might not carry the exact version. This hard pinning was introduced in eb02decdf but wasn't strictly necessary to achieve its compatibility goal.

tests: make running ls in a no longer existing directory more portable On Linux, ls -A simply returns nothing and the exit code is 0. On NetBSD, ls -A complains that . doesn't exist and the exit code is 1. Sadly, it's not possible to do something like "[1] (?)", so " || true" is the best I could come up with.