KTOR-6928 Make refresh_token optional according to RFC 6749 #4022
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Subsystem
Client-Auth
Motivation
https://youtrack.jetbrains.com/issue/KTOR-6928/Auth-Make-refreshToken-of-BearerTokens-class-nullable
Solution
Make refreshToken nullable. This change is ABI compatible, but not API. On the other hand this parameter isn't used by Ktor, only by users.
Alternative: wait for v3.