feat: oauth2client json pass jwks_uri when private_key_jwt

[burahimu]

Related Issue or Design Document

The jwks_uri parameter is never passed to the Hydra admin API. IMHO, If we want to use the private_key_jwt auth method we need to pass the jwks uri.

WDYT?

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Further comments

Feel free to close the PR if it's not relevant

[CLAassistant]

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