update @fastify/swagger to 8.x

[franher]

At @fastify/swagger v8.0.0, swagger-ui has been removed and migrated to a specific Fastify plugin, fastify/fastify-swagger-ui. This issue intends the update of @fastify/swagger to the latest version and the usage of @fastify/fastify-swagger-ui to keep the bautajs-fastify swagger working as until now.

Links of interest

• migrating-from-version-7-to-8