Bump version of oauth-credentials

[bzzitsme]

Bumped version includes fix for #147
Fix itself: jenkinsci/oauth-credentials-plugin#16
Release: https://github.com/jenkinsci/oauth-credentials-plugin/releases/tag/0.646.v02b_66dc03d2e

Testing done

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[bzzitsme]

@jenkinsci/google-oauth-plugin-developers, @jtnord could you please merge and release it, when you have a chance? 😄

[jtnord]

could you please merge and release it,

there is no need to release (or even merge this urgently) afaict. The fix is available as soon as anyone updates oauth-credentials and there is no update of this particular plugin required.

[jtnord]

not releasing as AFAICT there is no need and a release is a manual m-r-p invocation