Bump Lightning CSS (#19771)

This PR bumps Lightning CSS. The `node/index.js` file in the package
changed, so we had to update the patched version of it as well.

We also had to update the patches for `@parcel/watcher` and
`lightningcss` now that they ship with `detect-libc@2`. Unfortunately,
we still require the patches because we also need to take the
`process.env.PLATFORM_LIBC` into account. Another issue is that bun
needs to be able to statically analyze the `require(…)` calls, so using
the nice `parts.push` approach doesn't really work here.

# Test plan

1. Existing tests should pass
2. Updated some tests to reflect the changes in the generated CSS based
on the version bump.

[ci-all]