[deps] AC: Update mini-css-extract-plugin to v2.8.1 #19464

Job	Run time
Verify Electron Version	6s
Setup	7s
Linux Build	8m 6s
MacOS Build	5m 42s
Windows Build	11m 53s
Browser Build / Setup	7s
Browser Build / Locales Test	7s
Browser Build / Build	2m 39s
Browser Build / Build Safari	28m 56s
Browser Build / Crowdin Push	0s
Browser Build / Check for failures	42s
MacOS Package Prod Release Asset	0s
MacOS Package Dev Release Asset	0s
MacOS Package GitHub Release Assets	0s
Crowdin Push	0s
Check for failures	21s
	58m 46s

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