Upgrade dependencies to get rid of deprecation warnings

[Zegnat]

Running npm install --omit "dev" before this PR:

npm WARN deprecated [email protected]: This module is not supported, and leaks memory. Do not use it. Check out lru-cache if you want a good and tested way to coalesce async requests by a key value, which is much more comprehensive and powerful.
npm WARN deprecated [email protected]: Rimraf versions prior to v4 are no longer supported
npm WARN deprecated [email protected]: Glob versions prior to v9 are no longer supported

added 22 packages, and audited 23 packages in 7s

And after:

added 10 packages, and audited 11 packages in 7s

Warnings were caused by dependencies from flat-cache. Previously eleventy-fetch was blocked from updating because of the supported Node.js version, but now that 18+ is required we align with flat-cache again.

Overall these upgrades half our number of dependencies and get rid of all the warnings! 🥳

Additional notes:

1. p-queue has gone ESM-only. For now, eleventy-fetch has not made that step. This PR pins the p-queue dependency to the exact last non-ESM version.

2. AVA is upgraded to the latest version of the test runner. This will result in an Unsupported engine warning on Node.js below version 18.18. However I was able to run the eleventy-fetch tests with AVA on Node.js v18.0.0 no problem, and I think it is worth the warning (for developers only) to be able to keep dependencies in check.

[zachleat]

Thank you! Shipping with Eleventy Fetch v5.0.0