Bump actions/cache from 3 to 4 #538

Job	Run time
postgresql-mvc (ubuntu-20.04, maven)	11m 17s
postgresql-webflux (ubuntu-20.04, maven)	10m 29s
postgresql-mvc-jwt (ubuntu-20.04, maven)	11m 29s
postgresql-webflux-jwt (ubuntu-20.04, maven)	9m 59s
postgresql-mvc (ubuntu-20.04, gradle)	12m 29s
postgresql-webflux (ubuntu-20.04, gradle)	11m 36s
postgresql-mvc-jwt (ubuntu-20.04, gradle)	13m 0s
postgresql-webflux-jwt (ubuntu-20.04, gradle)	11m 45s
postgresql-mvc (macos-11, maven)	51m 52s
postgresql-webflux (macos-11, maven)	37m 42s
postgresql-mvc-jwt (macos-11, maven)	37m 19s
postgresql-webflux-jwt (macos-11, maven)	33m 48s
postgresql-mvc (macos-11, gradle)	43m 40s
postgresql-webflux (macos-11, gradle)	49m 4s
postgresql-mvc-jwt (macos-11, gradle)	39m 59s
postgresql-webflux-jwt (macos-11, gradle)	44m 39s
postgresql-mvc (windows-2022, maven)	14m 48s
postgresql-webflux (windows-2022, maven)	12m 55s
postgresql-mvc-jwt (windows-2022, maven)	15m 10s
postgresql-webflux-jwt (windows-2022, maven)	13m 56s
postgresql-mvc (windows-2022, gradle)	17m 13s
postgresql-webflux (windows-2022, gradle)	14m 36s
postgresql-mvc-jwt (windows-2022, gradle)	16m 36s
postgresql-webflux-jwt (windows-2022, gradle)	14m 42s
	9h 10m 3s

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