- `package.json` is bundled by `esbuild` because we depend on it in `actions-util.ts`
- That is so we can access the `version` property
- We now use `build.mjs` to define a constant for it instead
- We also set this constant in `ava.setup.mjs` for tests
- This reduces the size of the generated `.js` files and avoids changing them entirely in some cases
