[BEAM-12069] Make mock a test-only dependency (#14328)
[BEAM-12069] Make mock a test-only dependency (#14328)

* Update mock version

* Move mock to REQUIRED_TEST_PACKAGES

* Keep upper bound

Co-authored-by: Brian Hulette <e5fce473ba473e73422afc5bb319c5cc358ed4c8@gmail.com>
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