resolve dependency conflict

[morkeltry]

rimraf is a dependency of some dependencies.
Latest version is 6, which requires node >= 20
(idk why that is rimraf's business or how it helps it delete files more effectively but, sure, let's just force continual updates because dumping version conflicts on users probably makes them secure in the end).

Anyway...

Pinning rimraf@5.0.7 in package.json works, as would forcing users to use node v20 / v22.