feat(mvn): upgrade to Spring Boot 2.7.1 / Spring 5.3.21
feat(mvn): upgrade to Spring Boot 2.7.1 / Spring 5.3.21

upgraded Spring Boot and all its dependencies

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