Merged upstream 13.16.1 for GitLab 13.9
A notable change is the introduction of the builtin SSH server.
As a minor side effect of this change, config_test.go
was deemed
not worth adapting to the new structure of config.go
. In our case
it was also testing the application of default values, and the
serialization of HGRCPATH in one single string. This is trivial
enough not to require explicit direct testing, and the latter
is tested indirectly by internal/command/hg/hg_test.go