Fix bad type defs creeping into package

[mattmatters]

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Del depends on globby which I found was importing bad definitely typed files. In particular @types/glob would end up with a weird version of @types/minimatch.

Bumping del to v6 fixes this. There's also nothing in this bump that is breaking changes and is the last version before Del is switched over to esm only (which I personally think is a better move but noticed prs vetoing it for that reason).