Support for M-chip (arm64)

Hi @mapbox/spritezero maintainers, first of all thank you for this great library! I recently switched my development machine from an Intel-based MacBook to one with Apple’s M-series chip and noticed that the current dependency on mapnik@4.4.0 fails to install on Apple Silicon. The Mapnik team added native ARM64 (M-chip) support in @mapnik/mapnik@4.6.0, so updating the dependency to the lastest version would restore compatibility and ease installation for M-chip users.

Steps to reproduce the issue:
On an M-chip MacBook, clone this repo and run npm install
Observe build errors related to mapnik@4.4.0 not providing ARM64 binaries.

Expected behavior:
npm install should complete successfully on both Intel and Apple Silicon machines by using an ARM-compatible Mapnik.

Individua la dichiarazione della dipendenza per mapnik@4.4.0 e verifica come vengono installate le dipendenze in questo repository. Aggiornala alla versione di Mapnik compatibile con ARM64 indicata nell’issue, quindi esegui npm install su una macchina Apple Silicon e conferma che l’installazione continui a essere supportata anche su Intel.