kit: uvu test pattern is incorrect (especially on Windows)

[GrygrFlzr]

Describe the bug
Currently, the test pattern used is as follows:

kit/packages/kit/package.json

Line 53 in d9fc240

"test": "uvu src \"(spec.mjs|test/index.mjs)\""

There are two issues:

• The dots here are not literals as they have not been escaped, they represent "any character".
  For example, any file with a specxmjs extension would match.
• On Windows, test/index.mjs does not correctly locate integration tests. I can see on the github CI it at least works with the Linux system, though.
  

To Reproduce
pnpm test on a Windows system

Expected behavior
Run all tests.

Severity
Since the CI currently runs Linux anyway, core tests won't be missed, but as Windows-related contributions get added and access to the Windows CI becomes available, this will lead to tests being skipped and falsely reporting success on Windows.

Solution

{
  "test": "uvu src \"(spec\\.mjs|test/index\\.mjs|test\\\\index\\.mjs)\""
}

Will submit as a PR. Let me know if I'm missing something obvious with this change. Other than the fact it looks really ugly because we have to escape the pattern escapes to be valid JSON.