Fixed incoming fhir data parsing

[khavinshankar]

Proposed Changes

• Fixes the error while callback api is called in hcx
  https://coronasafe-network.sentry.io/issues/5835773366/?project=5182842&query=is%3Aunresolved+issue.priority%3A%5Bhigh%2C+medium%5D&referrer=issue-stream&statsPeriod=14d&stream_index=0

@coronasafe/care-backend-maintainers @coronasafe/care-backend-admins

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.24%. Comparing base (4f6296a) to head (09cf90d).
Report is 6 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2446      +/-   ##
===========================================
+ Coverage    64.20%   64.24%   +0.04%     
===========================================
  Files          240      240              
  Lines        13562    13544      -18     
  Branches      1947     1942       -5     
===========================================
- Hits          8707     8702       -5     
+ Misses        4496     4484      -12     
+ Partials       359      358       -1     

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