build(openapi): updated OpenAPI Generator version to 5.2.0
build(openapi): updated OpenAPI Generator version to 5.2.0

The Maven generator plugin for generating Java code from openapi.yml was upgraded from 5.1.0 to
5.2.0

zlamalp/perun,mvocu/perun,CESNET/perun,martin-kuba/perun,martin-kuba/perun,mvocu/perun,CESNET/perun,mvocu/perun,CESNET/perun,mvocu/perun,martin-kuba/perun,zlamalp/perun,zlamalp/perun,martin-kuba/perun,zlamalp/perun,CESNET/perun,martin-kuba/perun,mvocu/perun,zlamalp/perun,zlamalp/perun,CESNET/perun,martin-kuba/perun,zlamalp/perun,CESNET/perun,CESNET/perun,mvocu/perun,mvocu/perun,martin-kuba/perun