chore: Use maintained, simpler toolchain installation.

[codecov[bot]]

Codecov Report

Base: 79.61% // Head: 79.58% // Decreases project coverage by -0.03% :warning:

Coverage data is based on head (07ed2da) compared to base (1b0cdbf). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #40 +/- ## ========================================== - Coverage 79.61% 79.58% -0.04% ========================================== Files 18 18 Lines 1619 1621 +2 ========================================== + Hits 1289 1290 +1 - Misses 330 331 +1 ``` | [Impacted Files](https://codecov.io/gh/DanCardin/sauce/pull/40?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/lib.rs](https://codecov.io/gh/DanCardin/sauce/pull/40/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL2xpYi5ycw==) | `52.83% <0.00%> (-0.12%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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