Update to zig 0.15.0-dev.377+f01833e03

[sea-grass]

Hello! I was intrigued by seamstress and decided to try to run it on my machine. This PR is the product of me updating it to run on the latest Zig branch.

There are some updates to dependency versions, some refactoring due to ziglua, Zig builtins (@branchHint), Zig build system, and libxev API changes.

For the dependencies, I had to update them to conform with the new build.zig.zon structure:

• ziglua: I updated ziglua to the tip of the current main branch, while previously it was pointing at a branch on your fork (robbielyman/ziglua#byo-lua)
• libxev: I updated libxev to the tip of the current main branch, while previously it was pointing at a branch on your fork (robbielyman/libxev#seamstress-branch)
• zosc: Required some updates itself, which are in a PR (see Update to zig 0.15.0-dev.377+f01833e03 zosc#1). Once that's merged, the dependency reference needs to be updated again. (This is the reason this PR is in draft mode.)
• embed_file: Updated to the latest main
• known_folders: Updated to the latest main

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Side note: I got it to run and it drops me into a Lua repl, but I'm not sure what else to do from here! I did find Grid Studies, but I don't own a Monome Grid. Is this only suitable for users who own a Monome Grid, or is it capable of working with OSC/midi with programs on the user's machine as well? I'd be excited to play around with this given more docs/guidance, or if there are features you're planning on implementing related to software synths I would also be willing to contribute some code.