[SDK-3197] Update test deps

[jimmyjames]

Updates test dependencies to latest versions.

Notes:

• Due to in issue with jackson 2.12, it was exporting junit 4.13.2 as a transitive dependency, overriding our declared 4.12 dependency. This change explicitly updates to 4.13.2 which will also be required when updating our jackson dependency, as we'll be making use of some of the features in 4.13.2.
• Replaces the now-deprecated IsCollectionContaining with IsIterableContaining. Other deprecated methods that involve less trivial code changes (e.g, deprecation of ExpectedException in favor of assertThrows) are not included in this PR, but can be made opportunistically going forward.