Update okta (#150)
Update okta (#150)

* Update Okta library

According to https://github.com/okta/okta-sdk-java, version <1 is
deprecated.

Also, it mitigates an implicit dependency conflict in jackson (okta wants
2.5, aws-sdk 2.6).

* Use fixed Jackson versions

While okta-sdk requires jackson 2.9.x, aws-sdk requires 2.6.x. In order
to prevent unforseen errors by version conflicts, use fixed versions of
this library.

oktadeveloper/okta-aws-cli-assume-role,oktadeveloper/okta-aws-cli-assume-role,oktadeveloper/okta-aws-cli-assume-role