Add regression test for sass/dart-sass#2208 #1407

Job	Run time
Static analysis	21s
Lint spec files	19s
Unit tests	37s
Language \| Dart Sass \| Dart stable	59s
Language \| Dart Sass \| Dart dev	59s
JS API \| Pure JS \| Node lts/* \| ubuntu-latest	1m 20s
JS API \| Pure JS \| Browser	1m 27s
JS API \| Pure JS \| Node lts/* \| windows-latest	3m 27s
JS API \| Pure JS \| Node lts/* \| macos-latest	2m 51s
JS API \| Embedded \| Node lts/* \| ubuntu-latest	4m 43s
JS API \| Pure JS \| Node lts/-1 \| ubuntu-latest	1m 54s
JS API \| Embedded \| Node lts/* \| windows-latest	6m 54s
JS API \| Pure JS \| Node lts/-2 \| ubuntu-latest	1m 24s
JS API \| Embedded \| Node lts/* \| macos-latest	12m 20s
JS API \| Pure JS \| Node lts/-3 \| ubuntu-latest	1m 33s
JS API \| Embedded \| Node lts/-1 \| ubuntu-latest	4m 51s
JS API \| Embedded \| Node lts/-2 \| ubuntu-latest	4m 55s
JS API \| Embedded \| Node lts/-3 \| ubuntu-latest	4m 48s
	55m 42s

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