Add specs for hash key ends with `!` or `?` #1596

Job	Run time
RuboCop	27s
specs (ubuntu, 3.0.6)	1m 29s
specs (ubuntu, 3.1.4)	1m 29s
specs (ubuntu, 3.2.2)	1m 23s
specs (ubuntu, 3.3.0)	1m 22s
specs (macos, 3.0.6)	2m 49s
specs (macos, 3.1.4)	2m 54s
specs (macos, 3.2.2)	1m 40s
specs (macos, 3.3.0)	1m 39s
specs (windows, 3.0.6)	3m 51s
specs (windows, 3.1.4)	4m 9s
specs (windows, 3.2.2)	4m 2s
specs (windows, 3.3.0)	4m 28s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 21s
	33m 3s

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