Get FHIR core transitively, update jackson

[JPercival]

• Remove explicit FHIR core version since the HAPI bom now includes it
• Align Jackson with the HAPI version
• Change Jackson deps from "implementation" to "api" so they are exported downstream

[github-actions]

Formatting check succeeded!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.89%. Comparing base (dc17ac4) to head (4c6f5ff).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1332      +/-   ##
============================================
- Coverage     62.89%   62.89%   -0.01%     
+ Complexity     6109     6108       -1     
============================================
  Files           468      468              
  Lines         25354    25354              
  Branches       4719     4719              
============================================
- Hits          15947    15946       -1     
- Misses         7270     7271       +1     
  Partials       2137     2137              

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