rust: upgrade supported Rust toolchain version
A few months ago¹, a decision was made to move the Rust toolchain target to
whatever Debian Testing was tracking. I didn't have the bandwidth to act on
it until now.
This is starting to be even more problematic than before, now that edition 2021
is out.
The CI has been updated to track the current Debian testing version, 1.61.0.
[1] https://lists.mercurial-scm.org/pipermail/mercurial-packaging/2022-April/000338.html
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.
Notes for packagers
===================
Mercurial ships a copy of the python-zstandard sources. This is used to
provide support for zstd compression and decompression functionality. The
module is not intended to be replaced by the plain python-zstandard nor
is it intended to use a system zstd library. Patches can result in hard
to diagnose errors and are explicitly discouraged as unsupported
configuration.