Update minimum cmake in example #586

Job	Run time
build_conda (windows-latest, conda)	6m 42s
build_pip (ubuntu-latest, pip)	9m 18s
build_conda (macos-latest, conda)	1m 10s
build_pip (macos-latest, pip)	30s
build_conda (ubuntu-latest, conda)	5m 45s
build_pip (windows-latest, pip)	3m 51s
	27m 16s

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