PyJWT Issuer field partial matches allowed

SummaryThe wrong string if check is run for iss checking, resulting in "acb" being accepted for "abc". DetailsThis is a bug introduced in version 2.10.0: checking the "iss" claimchanged from isinstanceissuer, list to isinstanceissuer,Sequence.diff- if isinstanceissuer, list:+ if isinstanceissuer,...