SCSS Attribute Selector Syntax Highlighting Broken

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Issue Type: Bug

For code like this

.position-metadata li[data-type="team"] {
  background-image: image-url("team-icon.svg");
}

The text 'team' should be highlighted as a string but is not.

VS Code version: Code 1.50.1 (d2e414d, 2020-10-13T14:53:05.704Z)
OS version: Darwin x64 18.7.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz (8 x 2200)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	66, 53, 27
Memory (System)	16.00GB (0.26GB free)
Process Argv	. --crash-reporter-id 3f419053-17d7-4526-9fc2-e9eddee9554a
Screen Reader	no
VM	0%

Extensions (14)

Extension	Author (truncated)	Version
asciidoctor-vscode	asc	2.8.4
vscode-intelephense-client	bme	1.5.4
vscode-markdownlint	Dav	0.37.1
vscode-eslint	dba	2.1.13
gitlens	eam	10.2.2
prettier-vscode	esb	5.7.1
vscode-rufo	mbe	0.2.1
vscode-docker	ms-	1.7.0
vetur	oct	0.28.0
vscode-jest	Ort	3.2.0
ruby	reb	0.27.0
vscode-yaml	red	0.11.1
vscode-sort-json	ric	1.18.1
vscode-ruby	win	0.27.0

[alexr00]

Copied to the repository where our SCSS syntax highlighting grammar comes from: atom/language-sass#280