Tool chain setup fails in Test on windows-latest Rust stable

[HaoYang670]

Describe the bug
There are tool chain setup failures in several PRs: #2073, #2064, #2041

Run rustup toolchain install stable
info: syncing channel updates for 'stable-x86_64-pc-windows-msvc'
info: checking for self-updates
  stable-x8[6](https://github.com/apache/arrow-rs/runs/7354128765?check_suite_focus=true#step:3:7)_64-pc-windows-msvc unchanged - rustc 1.62.0 (a8314ef[7](https://github.com/apache/arrow-rs/runs/7354128765?check_suite_focus=true#step:3:8)d 2022-06-27)
info: downloading self-update
warning: tool `rustfmt` is already installed, remove it from `C:\Users\runneradmin\.cargo\bin`, then run `rustup update` to have rustup manage this tool.
warning: tool `cargo-fmt` is already installed, remove it from `C:\Users\runneradmin\.cargo\bin`, then run `rustup update` to have rustup manage this tool.
error: error: Invalid value for '<+toolchain>': Toolchain overrides must begin with '+'
Error: Process completed with exit code 1.

[tustvold]

I looked into this a bit under #2069 but it seems to have fixed itself, or at the very least be intermittent...

[tustvold]

I think #2070 has fixed this