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Upgraded some of the dependencies to address security alerts and make dependabot a bit happier. Surprisingly haven't faced compatibility issues.
Not ideal as a few more could be upgraded to the latest's versions (mockwebserver, testng, lombok) but it seems to require upgrade of Gradle. I haven't worked with Gradle, so it would require extra time to figure a few thigs out.
@pashidlos could you take a look & merge those to master if build succeeds ?