build: Updating stylelint-config-wikimedia to 0.11.1

The following rules are failing and were disabled:
* declaration-property-unit-disallowed-list

Change-Id: I9a0a74f4d8a99fc13f0c27064c23443bfc5feaa9

.stylelintrc.json

@@ -6,6 +6,7 @@
 		"function-comma-newline-after": "always-multi-line",
 		"function-comma-space-after": "always-single-line",
 		"function-parentheses-newline-inside": "always-multi-line",
-		"function-parentheses-space-inside": "always-single-line"
+		"function-parentheses-space-inside": "always-single-line",
+		"declaration-property-unit-disallowed-list": null
 	}
 }

package.json

@@ -20,7 +20,7 @@
 		"grunt-banana-checker": "0.9.0",
 		"grunt-eslint": "23.0.0",
 		"grunt-stylelint": "0.16.0",
-		"stylelint-config-wikimedia": "0.10.3",
+		"stylelint-config-wikimedia": "0.11.1",
 		"svgo": "2.3.1",
 		"wdio-mediawiki": "1.1.1",
 		"webdriverio": "7.4.6"