Bump undici from 5.28.3 to 5.28.4 in /examples/cloudflare-workers (#172)

Bumps [undici](https://github.com/nodejs/undici) from 5.28.3 to 5.28.4. - [Release notes](https://github.com/nodejs/undici/releases) - [Commits](nodejs/undici@v5.28.3...v5.28.4) --- updated-dependencies: - dependency-name: undici dependency-type: indirect ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]