Update OPENJDK_TAG to merged level jdk-11.0.25+6 #252

Job	Run time
Select platforms	1s
linux-x64-hs-nopch / build (debug)	1m 42s
linux-x64-hs-minimal / build (debug)	1m 44s
linux-cross-compile / build (aarch64)	4m 1s
linux-x64 / build (debug)	1m 32s
linux-cross-compile / build (arm)	5m 16s
linux-cross-compile / build (s390x)	4m 0s
linux-x64 / build (release)	1m 41s
linux-x64-hs-optimized / build (debug)	1m 28s
linux-x64-hs-zero / build (debug)	1m 34s
linux-cross-compile / build (ppc64le)	3m 56s
macos-aarch64 / build (debug)	2m 33s
windows-aarch64 / build (debug)	3m 23s
macos-aarch64 / build (release)	2m 42s
linux-x86 / build (debug)	2m 5s
windows-aarch64 / build (release)	3m 24s
macos-x64 / build (debug)	2m 48s
linux-x86 / build (release)	1m 41s
macos-x64 / build (release)	2m 1s
windows-x64 / build (debug)	3m 45s
windows-x64 / build (release)	3m 43s
linux-x64	0s
linux-x86	0s
macos-x64	0s
windows-x64	0s
Remove bundle artifacts	1s
	55m 1s

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