Headers getting overwritten n scala-akka client generation

[ParakhMittal]

Description

In scala-akka-client code that is getting generated, addAuthentication method is called after setting headers using header parameter in the below mentioned line
addAuthentication(request.credentials)(
httpRequest.withHeaders(headers(request.headerParams))
)

However, in addAuthentication method, we are using withHeaders method that overwrites the headers set using header parameters.

openapi-generator version

Master 5.0.0

Command line used for generation

akka-scala-client

Steps to reproduce

Add bearer token headers along with other headers in the yaml to generate the client

[ParakhMittal]

Fix proposed in the pull request #7259