refactor(dependency): ocaml -> 4.11

[bryphe]

Gotta get Onivim caught up with: revery-ui/revery#1066

This also will let us start using memtrace (since 4.11 has the Gc.Memprof apis) which will be really helpful for perf: https://github.com/janestreet/memtrace

[EduardoRFS]

@bryphe why not a 4.12? 4.11 doesn't support macOS ARM64 while 4.12 and 4.10.2 do.

And at least for building OCaml the differences between native ARM64 and Rosetta emulation is huge.

[bryphe]

@bryphe why not a 4.12? 4.11 doesn't support macOS ARM64 while 4.12 and 4.10.2 do.

Good question @EduardoRFS - primarily to minimize risk - I like to take baby steps with critical dependencies like OCaml. Sometimes there can be surprises (a perf regression... a change in GC behavior that exposes a bug in our C FFI interop... packaging gets broken... etc).

I'll start a PR for 4.12 after this is in. Having the ARM build (#2708) is a good reason to not wait too long to bring in 4.12 👍 I didn't realize 4.11 doesn't support macOS ARM64...