v0.31.4 JSON update & fixes

Overview

• Updated the way JSON is handled, users can now set custom JSON marshal/unmarshal funcs (not only from 3 already supported ways)
• Fixed #216
• Updated dependencies

What's Changed

• Bump github.com/bytedance/sonic from 1.12.2 to 1.12.3 by @dependabot in #209
• Bump github.com/valyala/fasthttp from 1.55.0 to 1.56.0 by @dependabot in #210
• Bump github.com/valyala/fasthttp from 1.55.0 to 1.56.0 in /examples by @dependabot in #212
• Bump golang.ngrok.com/ngrok from 1.10.0 to 1.11.0 in /examples by @dependabot in #214
• Bump github.com/valyala/fasthttp from 1.56.0 to 1.57.0 by @dependabot in #215

Full Changelog: v0.31.3...v0.31.4