Update lerc version

[ggetz]

The lerc package is still an outstanding direct dependency update and is pinned on 2.x.

The latest versions requires using wasm. It looks like, despite the fact that the wasm file included with the package is built to support multiple ways of loading the module, the lerc API only exposes one way to load wasm files and that way does not easily fit within our current worker architecture due to assumptions about the file structure, throwing errors when loading for createVerticesFromHeightmap.

Ideally, we'd be able to initialize the wasm module directly as we do with other third part wasm-based libraries.