dist/main.js hasn't been updated for a while; new LLVM versions are unavailable

[gentoo-root]

When used as a GitHub action, dist/main.js is the code that runs, but it looks outdated: last change at https://github.com/KyleMayes/install-llvm-action/commit/8b37482c5a2997a3ab5dbf6561f8109e2eaa7d3b; the change that adds 18.1.4 — 18.1.6 is not included. dist/main.js needs to be recompiled and synced with the recent changes.