Update client to Orthanc 1.12.1

[gacou54]

The Orthanc client has been regenerated on the Orthanc 1.12.1 version (source of the changelist: https://hg.orthanc-server.com/orthanc/file/Orthanc-1.12.1/NEWS).

From 1.12.1:

• API version upgraded to 21
• "/tools/create-dicom" can now be used to create Encapsulated 3D Manufacturing Model IODs (MTL, OBJ, or STL)
• Added a route to delete the output of an asynchronous job (right now only for archive jobs): e.g. DELETE /jobs/../archive

From 1.12.0:

• New URIs "/.../{id}/labels/{label}" to test/set/remove labels
• "/patients/{id}", "/studies/{id}", "/series/{id}" and "/instances/{id}" contain the "Labels" field
• "/tools/find" now accepts the "Labels" and "LabelsConstraint" arguments
• "/tools/labels" lists all the labels that are associated with any resource
• "/system": added "UserMetadata" and "HasLabels"
• Added option "?numeric" if listing metadata

Also, the new client has been generated with the simple-openapi-client 0.4.0, which implies:

• Allow the client Orthanc to return raw responses
• update httpx dependencies

Details:

• All tests made with unittest has been refactored to use pytest