Changes to Update a case

the header request parameter idempotency-key became required

header request parameter idempotency-key list-of-types was narrowed by removing types null

for the header request parameter idempotency-key, the type was generalized from no type to string

the response property current_version became optional for the status 409

response property current_version list-of-types was widened by adding types null to media type application/json of response 409

added the new optional header request parameter idempotency-key

the request property case_version became required

added the non-success response with the status 428

added the new optional request property case_version

added the non-success response with the status 409

added the optional property data/case_version to the response with the 200 status