Fastify v6.0.0-alpha.0

What's Changed

• refactor: revert misleading error "Fastify instance is already listening" by @jean-michelet in https://github.com/fastify/fastify/pull/6098
• refactor(types)!: remove deprecated FastifyPlugin type by @Tony133 in https://github.com/fastify/fastify/pull/6897
• ci!: increase minimum runtime version by @climba03003 in https://github.com/fastify/fastify/pull/6904
• refactor(types)!: remove deprecated FastifyLoggerInstance in favor of FastifyBaseLogger by @Tony133 in https://github.com/fastify/fastify/pull/6906
• refactor!: remove Promise.withResolvers ponyfill by @jean-michelet in https://github.com/fastify/fastify/pull/6910
• refactor(types)!: remove deprecated FastifyRequestContext and FastifyReplyContext types by @Tony133 in https://github.com/fastify/fastify/pull/6920
• refactor!: disable error handler overrides by default by @jean-michelet in https://github.com/fastify/fastify/pull/6915
• refactor(types)!: remove deprecated ValidationResult type alias by @Tony133 in https://github.com/fastify/fastify/pull/6914
• chore(deps)!: upgrade undici v8.x by @Tony133 in https://github.com/fastify/fastify/pull/6921
• refactor!: remove FSTDEP022 by @climba03003 in https://github.com/fastify/fastify/pull/6908
• chore(sponsor): add testmu ai by @Eomm in https://github.com/fastify/fastify/pull/6922
• docs: add per-route logging for Google Cloud Functions by @slegarraga in https://github.com/fastify/fastify/pull/6907
• refactor!: remove FSTDEP023 deprecation by @jean-michelet in https://github.com/fastify/fastify/pull/6913
• refactor!: remove FSTDEP024 deprecation by @jean-michelet in https://github.com/fastify/fastify/pull/6912
• refactor!: remove FSTDEP025 by @jean-michelet in https://github.com/fastify/fastify/pull/6909
• test: remove @sinonjs/fake-timers by @climba03003 in https://github.com/fastify/fastify/pull/6934
• refactor(types)!: remove deprecated req in request.d.ts by @Tony133 in https://github.com/fastify/fastify/pull/6935
• refactor(types)!: remove ResSerializerReply type by @jean-michelet in https://github.com/fastify/fastify/pull/6911

Full Changelog: https://github.com/fastify/fastify/compare/v5.11.3...v6.0.0-alpha.0