fix JDK version in README.md #24

Job	Run time
postgresql-mvc (ubuntu-20.04, maven)	11m 2s
postgresql-webflux (ubuntu-20.04, maven)	9m 56s
postgresql-mvc-jwt (ubuntu-20.04, maven)	11m 54s
postgresql-webflux-jwt (ubuntu-20.04, maven)	9m 51s
postgresql-mvc (ubuntu-20.04, gradle)	12m 39s
postgresql-webflux (ubuntu-20.04, gradle)	11m 21s
postgresql-mvc-jwt (ubuntu-20.04, gradle)	12m 5s
postgresql-webflux-jwt (ubuntu-20.04, gradle)	11m 7s
postgresql-mvc (macos-11, maven)	31m 24s
postgresql-webflux (macos-11, maven)	39m 57s
postgresql-mvc-jwt (macos-11, maven)	31m 22s
postgresql-webflux-jwt (macos-11, maven)	36m 7s
postgresql-mvc (macos-11, gradle)	43m 50s
postgresql-webflux (macos-11, gradle)	42m 54s
postgresql-mvc-jwt (macos-11, gradle)	43m 12s
postgresql-webflux-jwt (macos-11, gradle)	38m 59s
postgresql-mvc (windows-2022, maven)	14m 45s
postgresql-webflux (windows-2022, maven)	12m 27s
postgresql-mvc-jwt (windows-2022, maven)	15m 34s
postgresql-webflux-jwt (windows-2022, maven)	13m 26s
postgresql-mvc (windows-2022, gradle)	15m 54s
postgresql-webflux (windows-2022, gradle)	13m 43s
postgresql-mvc-jwt (windows-2022, gradle)	15m 40s
postgresql-webflux-jwt (windows-2022, gradle)	14m 13s
	8h 33m 22s

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