Improve CI

[daxpedda]

• Don't run CI on every push, but only on the main branch and in PRs.
• Cancel CI when a new one is already run on a newer commit.
• Use CARGO_TERM_COLOR.
• Use taiki-e/install-action.
• Make sure to always checkout the repo first, which avoids some issues, like running actions.
• Add Typos for spell checking.

[ModProg]

Did you try both versions?

The second one should only add the msrv: true right?

As 1.57.0 is then part of the default matrix?

[daxpedda]

Ah, I see, didn't pay close attention.
That works indeed.