[MAINT]: drop aggregate-error dependency

[isker]

Describe the need

The project's tsconfig targets es2023 and the stated node support is (at least?) node>16, but it still takes a dependency on aggregate-error, which is made redundant by a standard global for ~4 years now, introduced in versions older than these.

This dependency caused me trouble in an arcane monorepo rollup build that is mostly self-inflicted and probably experienced by nobody else, so I won't elaborate on the details. Instead I'll just appeal to the general principle that unneeded dependencies are bad 🌞.

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Code of Conduct

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