Bump gradle/actions from 3 to 4 #23

Job	Run time
Gradle Wrapper Validation	6s
Compile against JDKs and OSes (ubuntu-latest, 8)	43s
Compile against JDKs and OSes (ubuntu-latest, 11)	50s
Compile against JDKs and OSes (ubuntu-latest, 17)	44s
Compile against JDKs and OSes (ubuntu-latest, 21)	44s
Compile against JDKs and OSes (ubuntu-latest, 23)	49s
Compile against JDKs and OSes (macos-latest, 11)	40s
Compile against JDKs and OSes (macos-latest, 17)	43s
Compile against JDKs and OSes (macos-latest, 21)	42s
Compile against JDKs and OSes (macos-latest, 23)	46s
Test (8, 2.8.11)	47s
Test (8, 2.9.10)	44s
Test (8, 2.10.4)	49s
Test (8, 2.11.3)	50s
Test (8, 2.12.3)	46s
Test (8, 2.13.4)	27s
Test (8, 2.14.1)	32s
Test (11, 2.8.11)	43s
Test (11, 2.9.10)	55s
Test (11, 2.10.4)	47s
Test (11, 2.11.3)	48s
Test (11, 2.12.3)	48s
Test (11, 2.13.4)	31s
Test (11, 2.14.1)	30s
Test (17, 2.8.11)	49s
Test (17, 2.9.10)	42s
Test (17, 2.10.4)	54s
Test (17, 2.11.3)	44s
Test (17, 2.12.3)	46s
Test (17, 2.13.4)	32s
Test (17, 2.14.1)	29s
Test (21, 2.8.11)	42s
Test (21, 2.9.10)	50s
Test (21, 2.10.4)	49s
Test (21, 2.11.3)	43s
Test (21, 2.12.3)	47s
Test (21, 2.13.4)	31s
Test (21, 2.14.1)	32s
Test (23, 2.8.11)	48s
Test (23, 2.9.10)	47s
Test (23, 2.10.4)	46s
Test (23, 2.11.3)	47s
Test (23, 2.12.3)	48s
Test (23, 2.13.4)	32s
Test (23, 2.14.1)	29s
	31m 31s

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