Switch from form3tech to maintained golang-jwt

[neilgierman]

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Description

The fork of form3tech-oss/jwt-go has been archived and points to golang-jwt/jwt as the replacement (as does dgrijalva/jwt-go). golang-jwt/jwt looks to be the maintained, supported version going forward. For now using the 3.2.2+incompatible version for seamless change even though there are newer versions released at golang-jwt/jwt.

References

Ref: dgrijalva/jwt-go#462
Ref: https://github.com/form3tech-oss/jwt-go/blob/master/README.md
Ref: https://github.com/golang-jwt/jwt/blob/v3.2.2/MIGRATION_GUIDE.md

Testing

Existing unit tests pass and existing examples build with no issues after switching to golang-jwt/jwt

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master