Upgrade to steamworks-rs v0.12.1

[jespertheend]

No description provided.

[jespertheend]

This was deprecated in version 1.61 of the steamworks sdk:

ISteamUserStats:

• RequestCurrentStats is no longer necessary and has been removed. The Steam Client will synchronize this data before your game launches.

[jespertheend]

Seems like I'm running into an error with these changes:

Error: The specified procedure could not be found.
\\?\C:\Users\Jesper\Documents\repositories\steamworks.js\dist\win64\steamworksjs.win32-x64-msvc.node
    at process.func [as dlopen] (node:electron/js2c/node_init:2:2559)
    at Module._extensions..node (node:internal/modules/cjs/loader:1602:18)
    at Object.func [as .node] (node:electron/js2c/node_init:2:2559)
    at Module.load (node:internal/modules/cjs/loader:1295:32)
    at Module._load (node:internal/modules/cjs/loader:1111:12)
    at c._load (node:electron/js2c/node_init:2:16955)
    at Module.require (node:internal/modules/cjs/loader:1318:19)
    at require (node:internal/modules/helpers:179:18)
    at Object.<anonymous> (C:\Users\Jesper\Documents\repositories\steamworks.js\index.js:8:21)
    at Module._compile (node:internal/modules/cjs/loader:1484:14)

Still investigating what's going on here so I'll leave this as draft for now

[jespertheend]

All these changes are basically here to re-fix #77.
Noxime/steamworks-rs#128 was reverted in Noxime/steamworks-rs#241, and it seems like the fix on steamworks-rs's side is not coming back. So instead I tried to fix this on the rust side of things in steamworks.js. Basically a reference to each handle is kept in the CALLBACK_REGISTRY, which is removed from the registry when the user calls disconnect()

I'll have to admit I used a fair bit of AI to get this part to work as I'm not too familiar with rust. So feel free to make changes if this is absolute garbage.

[jespertheend]

Seems like the error was just a result of outdated redistributable files, this should be ready now!