Update the `H5` hasher to use the `H6`'s `FN(STORE)`. #674

Job	Run time
Build and test cmake:gcc9	30s
Build and test cmake:clang15	37s
Build and test cmake:clang15:asan	44s
Build and test cmake:clang15:tsan	48s
Build and test cmake:clang15:ubsan	59s
Build and test cmake:qemu-arm-neon-gcc	59s
Build and test cmake-osx:clang	39s
Build and test cmake-osx:gcc	35s
Build and test cmake-win64:msvc-rel	1m 9s
Build and test cmake-win64:msvc-dbg	1m 12s
Build and test fuzz:clang15	27s
Build and test python3.10:clang15	1m 47s
Build and test python3.10-win	34s
Build and test maven	29s
Build and test bazel:root	42s
Build and test bazel:go	1m 4s
Build and test bazel:java	2m 19s
Build and test bazel:research	23s
Build and test bazel-osx:root	1m 3s
Build and test bazel-osx:go	1m 36s
Build and test bazel-osx:java	3m 22s
Build and test bazel-osx:research	1m 3s
Build and test bazel-win:root	1m 20s
Build and test bazel-win:java	4m 23s
Build and test bazel-win:research	1m 50s
	30m 34s

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