Update quotes for heredocs with embedded Ruby with \n #1878

Job	Run time
RuboCop	31s
specs (ubuntu, 3.0.6)	1m 37s
specs (ubuntu, 3.1.4)	1m 35s
specs (ubuntu, 3.2.2)	1m 25s
specs (ubuntu, 3.3.0)	1m 23s
specs (ubuntu, 3.4.1)	1m 35s
specs (macos, 3.0.6)	1m 24s
specs (macos, 3.1.4)	1m 29s
specs (macos, 3.2.2)	1m 47s
specs (macos, 3.3.0)	1m 17s
specs (macos, 3.4.1)	1m 11s
specs (windows, 3.0.6)	6m 47s
specs (windows, 3.1.4)	5m 10s
specs (windows, 3.2.2)	4m 33s
specs (windows, 3.3.0)	4m 3s
specs (windows, 3.4.1)	4m 6s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 25s
	41m 18s

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