bump generator-jhipster to v8.1.0 #17

Job	Run time
postgresql-mvc (ubuntu-20.04, maven)	10m 17s
postgresql-webflux (ubuntu-20.04, maven)	10m 5s
postgresql-mvc-jwt (ubuntu-20.04, maven)	11m 3s
postgresql-webflux-jwt (ubuntu-20.04, maven)	9m 19s
postgresql-mvc (ubuntu-20.04, gradle)	3m 5s
postgresql-webflux (ubuntu-20.04, gradle)	10m 47s
postgresql-mvc-jwt (ubuntu-20.04, gradle)	2m 57s
postgresql-webflux-jwt (ubuntu-20.04, gradle)	2m 47s
postgresql-mvc (macos-11, maven)	31m 9s
postgresql-webflux (macos-11, maven)	38m 50s
postgresql-mvc-jwt (macos-11, maven)	40m 42s
postgresql-webflux-jwt (macos-11, maven)	32m 23s
postgresql-mvc (macos-11, gradle)	31m 16s
postgresql-webflux (macos-11, gradle)	42m 49s
postgresql-mvc-jwt (macos-11, gradle)	14m 9s
postgresql-webflux-jwt (macos-11, gradle)	13m 44s
postgresql-mvc (windows-2022, maven)	15m 33s
postgresql-webflux (windows-2022, maven)	13m 4s
postgresql-mvc-jwt (windows-2022, maven)	14m 27s
postgresql-webflux-jwt (windows-2022, maven)	12m 52s
postgresql-mvc (windows-2022, gradle)	7m 10s
postgresql-webflux (windows-2022, gradle)	14m 43s
postgresql-mvc-jwt (windows-2022, gradle)	7m 58s
postgresql-webflux-jwt (windows-2022, gradle)	7m 44s
	6h 38m 53s

Provide feedback