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

[dependabot]

Bumps hapi-fhir-version from 8.6.1 to 8.6.4.
Updates ca.uhn.hapi.fhir:hapi-fhir-base from 8.6.1 to 8.6.4

Updates ca.uhn.hapi.fhir:hapi-fhir-client from 8.6.1 to 8.6.4

Updates ca.uhn.hapi.fhir:hapi-fhir-structures-r5 from 8.6.1 to 8.6.4

Updates ca.uhn.hapi.fhir:hapi-fhir-structures-r4 from 8.6.1 to 8.6.4

Updates ca.uhn.hapi.fhir:hapi-fhir-structures-dstu3 from 8.6.1 to 8.6.4

Updates ca.uhn.hapi.fhir:hapi-fhir-structures-dstu2 from 8.6.1 to 8.6.4

Updates ca.uhn.hapi.fhir:hapi-fhir-structures-dstu2.1 from 8.6.1 to 8.6.4

Updates ca.uhn.hapi.fhir:hapi-fhir-structures-hl7org-dstu2 from 8.6.1 to 8.6.4

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[apupier]

requires manual change:

Error:  Failed to execute goal org.apache.camel:camel-api-component-maven-plugin:4.18.0-SNAPSHOT:fromApis (generate-test-component-classes) on project camel-fhir: Error generating source for org.apache.camel.component.fhir.api.FhirCapabilities: No public non-static methods found, make sure source JAR is available as project scoped=provided and optional=true dependency -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.camel:camel-api-component-maven-plugin:4.18.0-SNAPSHOT:fromApis (generate-test-component-classes) on project camel-fhir: Error generating source for org.apache.camel.component.fhir.api.FhirCapabilities: No public non-static methods found, make sure source JAR is available as project scoped=provided and optional=true dependency