Bump mockttp from 4.2.0 to 4.2.1

[dependabot]

Bumps mockttp from 4.2.0 to 4.2.1.

Commits

• b45e208 4.2.1
• 8875ccc Update mocha to fix some irrelevant vuln warnings
• 53bf43f Clean up test utils
• df28dee Clean up deps
• 78f8ad0 Make some implicit deps explicit
• 22cc7ba Update httpolyglot to fix unknown-over-TLS bug
• faeeb7b Simplify GHA CI config now we don't test on v18
• 7494a9e Add performance tests
• 20833cf Update Node testing versions in CI: match server v22 & drop v18
• See full diff in compare view

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📥 Commits

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