Update OPENJDK_TAG to merged level jdk-11.0.21+3 #67

Job	Run time
Select platforms	1s
linux-x64-hs-optimized / build (debug)	1m 31s
linux-x64-hs-minimal / build (debug)	1m 44s
linux-x64 / build (debug)	1m 38s
linux-x64 / build (release)	1m 32s
linux-x64-hs-nopch / build (debug)	1m 43s
linux-x64-hs-zero / build (debug)	1m 42s
linux-x86 / build (debug)	2m 48s
linux-x86 / build (release)	2m 1s
macos-x64 / build (debug)	3m 31s
macos-x64 / build (release)	3m 50s
macos-aarch64 / build (debug)	3m 21s
macos-aarch64 / build (release)	4m 3s
windows-aarch64 / build (debug)	4m 26s
windows-aarch64 / build (release)	4m 13s
windows-x64 / build (debug)	3m 27s
windows-x64 / build (release)	3m 47s
linux-x64	0s
linux-cross-compile	0s
linux-x86	0s
windows-x64	0s
macos-x64	0s
Remove bundle artifacts	3s
	45m 21s

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