refactor: change default brotli compression level to 4 #1
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A default compression level of 11 is likely too extreme/slow for most use cases.
Cloudflare recommends a default of 4 https://blog.cloudflare.com/this-is-brotli-from-origin/#brotli-compression-to-11
the fastify-compress plugin changed their default based on this recommendation too fastify/fastify-compress#287 (comment)