chore: bump mockttp from 2.2.4 to 2.3.0 in /web3.js (solana-labs#20647)

Bumps [mockttp](https://github.com/httptoolkit/mockttp) from 2.2.4 to 2.3.0.
- [Release notes](https://github.com/httptoolkit/mockttp/releases)
- [Commits](httptoolkit/mockttp@v2.2.4...v2.3.0)

---
updated-dependencies:
- dependency-name: mockttp
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>