contrib: upgrade Rust in Windows automation
I'm not sure why we don't install the minimum required Rust version
here like we do for Linux. Whatever: that's unrelated to wanting to
stay modern.
Differential Revision: https://phab.mercurial-scm.org/D10677
{
"version": 1,
"project": "mercurial",
"project_url": "https://mercurial-scm.org/",
"repo": "..",
"branches": ["default", "stable"],
"environment_type": "virtualenv",
"show_commit_url": "https://www.mercurial-scm.org/repo/hg/rev/",
"benchmark_dir": "benchmarks",
"env_dir": "../.asv/env",
"results_dir": "../.asv/results",
"html_dir": "../.asv/html"
}