Bump undici and jest-environment-miniflare

Bumps [undici](https://github.com/nodejs/undici) to 5.28.4 and updates ancestor dependency [jest-environment-miniflare](https://github.com/cloudflare/miniflare/tree/HEAD/packages/jest). These dependencies need to be updated together.


Updates `undici` from 5.28.2 to 5.28.4
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v5.28.2...v5.28.4)

Updates `jest-environment-miniflare` from 2.14.3 to 2.14.4
- [Release notes](https://github.com/cloudflare/miniflare/releases)
- [Commits](https://github.com/cloudflare/miniflare/commits/v2.14.4/packages/jest)

---
updated-dependencies:
- dependency-name: undici
  dependency-type: indirect
- dependency-name: jest-environment-miniflare
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>