* Replace the unmaintained actions-rs/cargo that github actions
complains about using an old node version with plain cargo (this was the
original motivation for this PR)
* Use taiki-e/install-action to install critcmp directly
* Use a rust 1.70 nightly toolchain for udeps
* Cache python package build (this should cut a good chunk of ci time)
* yaml formatting courtesy of pycharm
Test Plan: CI itself
The Benchmark results aren't formatted properly if the ecosystem check finds differences because the ecosystem check doesn't emit a trailing newline.
This PR adds the trailing newline to the ecosystem check script.
