Current package.json deps are not compatible with npm v8.8.0+

[jeffposnick]

Running npm ci against our current main branch will succeed with npm v8.5.5.

When updating to npm v8.8.0 (I didn't try any of the intermediate versions), it fails with:

npm ERR! code ERESOLVE
npm ERR! ERESOLVE could not resolve
npm ERR! 
npm ERR! While resolving: [email protected]
npm ERR! Found: [email protected]
npm ERR! node_modules/markdown-it
npm ERR!   dev markdown-it@"^12.0.1" from the root project
npm ERR!   peer markdown-it@"*" from [email protected]
npm ERR!   node_modules/markdown-it-anchor
npm ERR!     dev markdown-it-anchor@"^8.1.2" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer markdown-it@">= 9.0.0 < 12.0.0" from [email protected]
npm ERR! node_modules/markdown-it-attrs
npm ERR!   dev markdown-it-attrs@"^3.0.3" from the root project
npm ERR! 
npm ERR! Conflicting peer dependency: [email protected]
npm ERR! node_modules/markdown-it
npm ERR!   peer markdown-it@">= 9.0.0 < 12.0.0" from [email protected]
npm ERR!   node_modules/markdown-it-attrs
npm ERR!     dev markdown-it-attrs@"^3.0.3" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

Presumably this is explained by something in https://github.com/npm/cli/releases, but I'm not sure what at the moment. Ideally, we'll be able to resolve this issue by updating the dependency that's triggering the breakage.