security: Bump github.com/golang-jwt/jwt/v4 to 4.5.0
This version is accepted by Prisma/Twistlock, resolving scan results for
issue PRISMA-2022-0270. Chosen over later versions to avoid a major
version with breaking changes that is otherwise unnecessary.
Note that in practice this is a false positive (see
https://github.com/golang-jwt/jwt/issues/258), but we should update the
version to aid customers relying on scanners that flag it.
Michael Zalimeni