
This downgrades jackson from the version switched to in HADOOP-18033 (2.13.0), to Jackson 2.12.7. This removes the dependency on javax.ws.rs-api, so avoiding runtime problems with applications using jersey-core v1 and/or jsr311-api. The 2.12.7 release still contains the fix for CVE-2020-36518. Contributed by PJ Fanning