[ruby/resolv] Check the second RegGetValue type #728

Job	Run time
Windows 2022/Visual C++ 2022 (check)	24m 41s
Windows 2025/Visual C++ 2022 (check)	29m 56s
Windows 11-arm/Visual C++ (btest test-basic test-tool)	16m 55s
Windows 2025/Visual C++ 2022 (test-bundled-gems)	26m 44s
Windows result	3s
	1h 38m 19s

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