Could not find org.mockito:mockito-core:3.8.3

[DanielJette]

Describe the bug

Testify Library is using a version of mockito that is too old and not available on MavenCentral.

Execution failed for task ':Library:generateDebugUnitTestStubRFile'.
> Could not resolve all files for configuration ':Library:debugUnitTestRuntimeClasspath'.
   > Could not find org.mockito:mockito-core:3.8.3.

This issue relates to:

• [x] The Kotlin library
• [ ] The Gradle plugin
• [ ] The IntelliJ Platform plugin
• [ ] The sample code
• [ ] The documentation

To Reproduce

Any recent CI build will demonstrate this issue: https://github.com/Shopify/android-testify/runs/4171092375?check_suite_focus=true

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. MacOS, Linux, Windows]
• Version [e.g. 10.15.5, 10]

Target Android Device (please complete the following information):

• Device: [e.g. Pixel, S20]
  • Physical or Virtual: [e.g. Android Virtual Device (Emulator), Firebase Cloud Image, Samsung Test Lab, Physical Device]
• API Level: [e.g. 21, 28, 30]
  • Testify Key: [e.g. Output from ./gradlew testifyKey]

Additional context Add any other context about the problem here.