fix: CI timeouts when testing registry utilities

[paulbalaji]

We've been seeing more flakes recently with the following error:

  1) Registry utilities
       Fetches warp route configs for github registry:
     Error: Timeout of 10000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/home/runner/work/hyperlane-registry/hyperlane-registry/test/unit/registry.test.ts)
      at listOnTimeout (node:internal/timers:581:17)
      at process.processTimers (node:internal/timers:519:7)

example flake: https://github.com/hyperlane-xyz/hyperlane-registry/actions/runs/13137714446/job/36657036638?pr=550

example flake in merge queue: https://github.com/hyperlane-xyz/hyperlane-registry/actions/runs/13138231701/job/36658748886

Though it's easy to retry in CI, it does mean that we sometimes kick PRs out of the merge queue and this increases time to merge.

Could either increase the timeout, or try investigating the source of the flake.