chore: Bump emsdk and cmake in js workflow

[spotandjake]

Attempting to bump our emsdk and cmake versions in our Generate.js workflow.

I still need to completely test these changes upstream in binaryen.ml and grain before we should consider merging this. Especially as the tests here only run on the initial commit, not the bot commiting the changed js.

Binaryen.ml tests can be found here: https://github.com/spotandjake/binaryen.ml/tree/spotandjake-es6

[ospencer]

@spotandjake is this good to go?

[spotandjake]

I just wanted todo a full test on the grain repo before we merge binaryen.ml looks to be passing though

[spotandjake]

@spotandjake is this good to go?

I think were going to need to discuss furthur if we want to merge this or not, my test in the grain repo grain-lang/grain#2332 showed that it wasn't my es6 changes causing the jsoo out of memory error on ubunut but the emsdk bump. We can fix this rather easily by lowering the number of builders like we already do on windows i'm just not sure if that's optimal or not. The passing branch with es6 changes as well here grain-lang/grain#2331

Happy to rerun my tests with less workers on the emsdk branch once we come to a conclussion to verify.