4.21.0

What's Changed

• chore: remove license-checker package by @Uzlopak in https://github.com/fastify/fastify/pull/4914
• chore: remove pump devDependency by @Uzlopak in https://github.com/fastify/fastify/pull/4913
• ci: create artifacts in coverage workflows by @Uzlopak in https://github.com/fastify/fastify/pull/4909
• docs(server): grammar and structure fixes by @Fdawgs in https://github.com/fastify/fastify/pull/4904
• docs: Fix typo in TypeScript docs ("@types/node", not "@node/types") by @jasongwartz in https://github.com/fastify/fastify/pull/4922
• [readme] add CII Best Practices Badge by @ljharb in https://github.com/fastify/fastify/pull/4926
• fix: lowercase type-providers headers types by @toomuchdesign in https://github.com/fastify/fastify/pull/4928
• ERR_REP_ALREADY_SENT hint that a route may be missing "return reply" by @mcollina in https://github.com/fastify/fastify/pull/4921
• fix: ReplyTypeConstrainer array type inference by @pedroescumalha in https://github.com/fastify/fastify/pull/4885

Full Changelog: https://github.com/fastify/fastify/compare/v4.20.0...v4.21.0