Created by: vgalloy
Motivation:
Remove useless warnings for webclient and resttemplate
See https://github.com/OpenAPITools/openapi-generator/issues/10788
cc @bbdouglas (2017/07) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) @jeff9finger (2018/01) @karismann (2019/03) @Zomzog (2019/04) @lwlee2608 (2019/10) @nmuesch (2021/01)