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
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2