Improve sqrt calculation #431

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-latest 2.7	1m 5s
ubuntu-latest 3.0	37s
ubuntu-latest 3.1	34s
ubuntu-latest 3.2	43s
ubuntu-latest 3.3	35s
ubuntu-latest 3.4	34s
ubuntu-latest debug	41s
ubuntu-latest head	25s
macos-latest 2.7	1m 15s
macos-latest 3.0	34s
macos-latest 3.1	49s
macos-latest 3.2	36s
macos-latest 3.3	20s
macos-latest 3.4	31s
macos-latest debug	26s
macos-latest head	25s
macos-14 2.7	1m 22s
macos-14 3.0	1m 26s
macos-14 3.1	29s
macos-14 3.2	29s
macos-14 3.3	26s
macos-14 3.4	26s
macos-14 debug	25s
macos-14 head	28s
windows-latest 2.7	3m 43s
windows-latest 3.3	3m 4s
windows-latest 3.4	2m 16s
windows-latest head	1m 56s
windows-latest mingw	1m 58s
windows-latest mswin	1m 37s
	30m 19s

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