v3 (deps): update to use gofiber/utils/v2

[KrisCarr]

Description

Updates v3-beta to use the gofiber/utils/v2 package.
testify seems to have also been indirectly bumped up to 1.8.1 from 1.8.0 as part of this.

This is required as the latest version of v3-beta requires aspects of v2. utils.StartTimeStampUpdater, utils.Timestamp utils.JSONUnmarshal etc.

Type of change

• Bug fix (dependency compatibility) (non-breaking change which fixes an issue)

Checklist:

• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• If new dependencies exist, I have checked that they are really necessary and agreed with the maintainers/community (we want to have as few dependencies as possible)

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