Unicode support and serverless bug fix

What's Changed

• chore(deps): c8 v9 by @renovate in #288
• chore(deps): @adonisjs/http-server v7 by @renovate in #287
• chore(deps): all non-major dependencies by @renovate in #286
• Handle Unicode characters by @Secreto31126 in #291
• Implemented user_function to handle callbacks by @Secreto31126 in #289
• Update index.ts by @Secreto31126 in #293

Full Changelog: 2.4.0...2.5.0