Add regression test for sass/dart-sass#2208 #1408

Job	Run time
JS API \| Pure JS \| Browser	1m 33s
JS API \| Pure JS \| Node lts/* \| ubuntu-latest	1m 22s
JS API \| Embedded \| Node lts/* \| ubuntu-latest	4m 32s
JS API \| Pure JS \| Node lts/* \| windows-latest	3m 33s
Language \| Dart Sass \| Dart stable	1m 4s
JS API \| Embedded \| Node lts/* \| windows-latest	7m 23s
JS API \| Pure JS \| Node lts/* \| macos-latest	2m 27s
Lint spec files	18s
Language \| Dart Sass \| Dart dev	1m 9s
JS API \| Embedded \| Node lts/* \| macos-latest	10m 45s
JS API \| Pure JS \| Node lts/-1 \| ubuntu-latest	1m 24s
JS API \| Pure JS \| Node lts/-2 \| ubuntu-latest	1m 20s
JS API \| Embedded \| Node lts/-1 \| ubuntu-latest	4m 39s
Static analysis	18s
JS API \| Pure JS \| Node lts/-3 \| ubuntu-latest	1m 23s
JS API \| Embedded \| Node lts/-2 \| ubuntu-latest	4m 57s
Unit tests	41s
JS API \| Embedded \| Node lts/-3 \| ubuntu-latest	4m 45s
	53m 33s

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