fix: refresh credentials for valid oauth2 token on each refresh #894
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Previously, the credentials object which is used for auto IAM authentication was only refreshed when it became invalid (expired). This is buggy as the credentials expiration is sometimes used to calculate when to schedule the next refresh (when credentials expiration is sooner than cert expiration). If we do not refresh the credentials object as part of the refresh operation than we get constant refreshes scheduled in the final few minutes before the credentials' OAuth2 token expires.
Fixes #892