re-introduce Dict.prototype.forEach

[yoshi-monster]

Of course this always happens 😅

I changed string.inspect, but the echo code that the compiler generates also uses the forEach method, and I don't think requiring a compiler release would be good. So I'm thinking we should add forEach back in for now :)

[lpil]

Could we make echo not use forEach and bump the required Gleam version? That seems like it would do the trick

[yoshi-monster]

Yeah that would be the alternative :)