Widen wasm-bindgen requirements check

[sigmachirality]

https://github.com/second-state/rustwasmc/blob/fb9b16514b86e953c594afe3d0d9f67d35900fa5/src/command/build.rs#L280

Seems unnecessarily brittle to hardcode dependency requirements like this - any chance this could be a range of supported dependencies (>.2.61 ?). It's been 3 years since .2.61 was the latest release, and it seems unreasonable to require people to downgrade from ~.2.86 to use this build tool.

Or does something in .2.62 break this tool?