[SPARK-32495][2.4] Update jackson versions to a maintained release, to fix various security vulnerabilities.#29334

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ScrapCodes wants to merge 3 commits intoapache:branch-2.4from

ScrapCodes:update-jackson

Commits on Aug 4, 2020

Update jackson versions to a maintained release, to fix various security vulnerabilities.
ScrapCodes
committed
update scala-reflect dependency on core, as in the newer version of jackson scala module it is not transitive.
ScrapCodes
committed
NON_NULL -> NON_ABSENT annotation change.
ScrapCodes
committed