build(deps): bump Hl7.Fhir.R4 from 5.9.1 to 5.10.1

Bumps [Hl7.Fhir.R4](https://github.com/FirelyTeam/firely-net-sdk) from 5.9.1 to 5.10.1.
- [Release notes](https://github.com/FirelyTeam/firely-net-sdk/releases)
- [Commits](FirelyTeam/firely-net-sdk@v5.9.1...v5.10.1)

---
updated-dependencies:
- dependency-name: Hl7.Fhir.R4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

src/Spark.Mongo/Spark.Mongo.csproj

@@ -10,7 +10,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Hl7.Fhir.R4" Version="5.9.1" />
+        <PackageReference Include="Hl7.Fhir.R4" Version="5.10.1" />
         <PackageReference Include="MongoDB.Driver" Version="2.28.0" />
     </ItemGroup>