chore: bump mockttp from 1.2.0 to 1.2.2 in /web3.js (solana-labs#16617)

Bumps [mockttp](https://github.com/httptoolkit/mockttp) from 1.2.0 to 1.2.2.
- [Release notes](https://github.com/httptoolkit/mockttp/releases)
- [Commits](httptoolkit/mockttp@v1.2.0...v1.2.2)

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

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