Revert "chore(deps): Bump hapi-fhir-version from 8.6.1 to 8.6.4"

[apupier]

Reverts #21257

it causing compilation issues, see #21257 (comment)

[github-actions]

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[davsclaus]

the problem is that this CI jobs don't install the -source JAR

camel-fhir-api
is not build with mvn install, so the -source JAR is not present that the fhir-component need to use.

[davsclaus]

this may help
#21298