Update github.com/golang-jwt/jwt to v4

[ItalyPaleAle]

Motivation

This project depended on the v3 of github.com/golang-jwt/jwt. All new versions of the library are now released with the go.mod-enabled github.com/golang-jwt/jwt/v4 import path (although there are no breaking changes from v3).

This is a security-related library and being on the latest version ensures that any security fix can be applied quickly.

Modifications

Updated the golang-jwt library to v4.

Verifying this change

• Make sure that the change passes the CI checks.

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): yes
• The public API: no
• The schema: no
• The default values of configurations: no
• The wire protocol: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable
• If a feature is not applicable for documentation, explain why? Internal change only
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[nodece]

@ItalyPaleAle Any updates?

[ItalyPaleAle]

@nodece my apologies, I disabled notifications for when CI fails (because I was getting spammed) so I didn't get alerted.

The CI is failing because it's trying to run tests using Go 1.16, but the go.mod file says that the minimum version is 1.18. I don't think it's an issue I can fix here :(

[nodece]

Closed by #1214