Resolving FHIR Core package 4.0.0 should always be substituted with 4.0.1

[alexzautke]

In https://chat.fhir.org/#narrow/channel/179166-implementers/topic/FHIR.20Core.20Dependency.20hl7.2Efhir.2Euv.2Esubscriptions-backport.2Er4/near/491315689 we discovered that the hl7.fhir.uv.subscriptions-backport.r4 v1.1.0 package is using FHIR Core 4.0.0 instead of FHIR Core 4.0.1. The 4.0.0 package should not be used. It was suggested by Grahame that we upgrade the package and use the correct one.

The next version of hl7.fhir.uv.subscriptions-backport.r4 will have this fixed, but we don't know when it will be released.

This is currently blocking a support ticket by gematik for Firely Terminal.

[mmsmits]

We have code to detect which FHIR release corresponds to a specific version, e.g. R4 -> 4.0.0 and 4.0.1
and also have to know which package belongs to a FHIR release. So we can use that to solve this.

Options:

• Make it a general rule to always use the current FHIR package of a specific version
• Only resolve 4.0.1 when encountering 4.0.0.
• Only resolve 4.0.1 when encountering 4.0.0. in hl7.fhir.uv.subscriptions-backport.r4 version 1.1.0

[mmsmits]

We go for "Only resolve 4.0.1 when encountering 4.0.0." because package 4.0.0. doesn't exist anymore.