v9.0.0

📚 PR:

• chore(deps-dev): bump react-dom from 18.1.0 to 18.2.0
• docs: remove redundant --save arg
• also update react-dom
• Merge pull request #561 from fastify/dependabot/npm_and_yarn/react-dom-18.2.0
• chore(deps-dev): bump @types/react-dom from 18.0.5 to 18.0.6
• chore(deps-dev): bump @types/react from 18.0.12 to 18.0.16
• Merge pull request #586 from fastify/dependabot/npm_and_yarn/types/react-18.0.16
• Merge pull request #585 from fastify/dependabot/npm_and_yarn/types/react-dom-18.0.6
• chore(deps): update next to latest, add undici
• test(wip): use real requests instead of inject
• test(wip): check only GET & HEAD methods
• chore(readme): replace POST with HEAD example
• test: re-add accidentally removed test
• chore: remove blank line in tests
• chore: require index only once in tests
• test: replace try/catch with throws & rejects
• Merge pull request #587 from drakhart/update-next
• chore(package): remove engines field (#558)
• chore(deps-dev): bump tap from 16.2.0 to 16.3.0 (#560)
• chore(deps-dev): bump @types/node from 17.0.42 to 18.0.0 (#564)
• chore(deps-dev): bump tsd from 0.20.0 to 0.21.0 (#562)
• chore(deps-dev): bump tsd from 0.21.0 to 0.22.0 (#567)
• chore(deps-dev): bump @types/node from 18.0.0 to 18.0.1 (#568)
• chore(deps-dev): bump @types/node from 18.0.1 to 18.0.3 (#572)
• chore(deps): bump fastify-plugin from 3.0.1 to 4.0.0 (#575)
• chore(deps-dev): bump @types/node from 18.0.3 to 18.0.6 (#574)
• chore(deps-dev): bump @types/node from 18.0.6 to 18.6.0 (#579)
• chore(deps-dev): bump @types/node from 18.6.0 to 18.6.3 (#580)
• ci: enable license checking (#581)
• chore(deps-dev): bump @types/node from 18.6.3 to 18.6.4 (#583)
• chore(deps): bump fastify-plugin from 4.0.0 to 4.1.0 (#584)
• upgrade to fastify 4 and latest under pressure (#589)
• chore(deps): bump json-schema from 0.2.3 to 0.4.0 (#590)