Fix leak in Socket#connect spec #1867

Job	Run time
RuboCop	32s
specs (ubuntu, 3.0.6)	1m 32s
specs (ubuntu, 3.1.4)	1m 33s
specs (ubuntu, 3.2.2)	58s
specs (ubuntu, 3.3.0)	1m 29s
specs (macos, 3.0.6)	1m 40s
specs (macos, 3.1.4)	1m 44s
specs (macos, 3.2.2)	1m 12s
specs (macos, 3.3.0)	1m 15s
specs (windows, 3.0.6)	4m 5s
specs (windows, 3.1.4)	4m 13s
specs (windows, 3.2.2)	4m 46s
specs (windows, 3.3.0)	3m 46s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 29s
	30m 14s

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