ci: Stop using most actions-rs actions.

[waywardmonkeys]

This leaves a usage of their grcov. The actions from this organization aren't maintained and result in warnings within the GitHub Actions UI.

[waywardmonkeys]

One difference is that the matchers in this toolchain action won't annotate the PR with warnings from clippy, etc.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.69% 🎉

Comparison is base (966faaf) 79.33% compared to head (140f3bb) 80.02%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
+ Coverage   79.33%   80.02%   +0.69%     
==========================================
  Files          27       27              
  Lines        5217     5217              
==========================================
+ Hits         4139     4175      +36     
+ Misses       1078     1042      -36     

see 5 files with indirect coverage changes

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[PierreZ]

Where do you see it is unmaintained?

[waywardmonkeys]

This is a good start: actions-rs/toolchain#216

The actions-rs actions are using deprecated functionality within GitHub Actions that is planned to go away. For examples of that, scroll down on the right panel in https://github.com/foundationdb-rs/foundationdb-rs/actions/runs/6038305182 and everything about set-output and node12.

[PierreZ]

Perfect, thanks for the links and the contribution 🎉