Update test runner

[laniakea64]

Using the test runner is now feeling a little slower than I remembered from before. And timing it confirms this.

This pull request restores the test runner to its prior performance on my system and fixes other issues found during the process:

• Change and update dependencies to fix security warnings found by cargo-audit. This one was a stretch of my current Rust/Cargo skill level, so @NoahTheDuke your review would be appreciated, thanks 🙂
• Update to regex 1.9.x (other versions of regex newer than 1.7.1 were either not changing performance or making it slightly worse)
• Update other Cargo deps

In case it's relevant to any details of these changes, I'm using Rust 1.72.1, ran into issues with 1.73 with other projects so am currently deferring getting newer Rust version until Rust 1.74 release.

[NoahTheDuke]

What was causing the slow-down? Otherwise, this looks good to me.

[laniakea64]

What was causing the slow-down?

Unfortunately I have no idea 🤷

Looking at Rust release dates, maybe I'm comparing to before upgrading Rust to 1.72.x? Edit: it's not related to Rust version change. Was able to find the actual cause, see next comment.

Otherwise, this looks good to me.

Great 👍 Thanks for reviewing, will merge later today.

[laniakea64]

What was causing the slow-down?

Actually I figured it out:

In the interim, that Xubuntu 22.04 system's kernel was updated from 5.15.x to 6.2.x. Going back to latest 5.15.x kernel and previous test runner (keeping Rust 1.72.1) restores the performance I remember.

Can confirm that the changes in this PR speed up the test runner under kernel 5.15.x also 👍