Upgrade postcss-simple-vars to 7.0

Author: shepmaster

ui/frontend/package.json

@@ -74,7 +74,7 @@
     "postcss": "^8.2.7",
     "postcss-loader": "^7.0.0",
     "postcss-nesting": "^10.1.1",
-    "postcss-simple-vars": "^6.0.3",
+    "postcss-simple-vars": "^7.0.1",
     "prettier": "^2.2.1",
     "stylelint": "^14.2.0",
     "stylelint-config-css-modules": "^4.0.0",

ui/frontend/yarn.lock

@@ -5036,10 +5036,10 @@ postcss-selector-parser@^6.0.10, postcss-selector-parser@^6.0.11, postcss-select
     cssesc "^3.0.0"
     util-deprecate "^1.0.2"
 
-postcss-simple-vars@^6.0.3:
-  version "6.0.3"
-  resolved "https://registry.yarnpkg.com/postcss-simple-vars/-/postcss-simple-vars-6.0.3.tgz#e66516c7fe980da3498f4a8ad400b9c53861806c"
-  integrity sha512-fkNn4Zio8vN4vIig9IFdb8lVlxWnYR769RgvxCM6YWlFKie/nQaOcaMMMFz/s4gsfHW4/5bJW+i57zD67mQU7g==
+postcss-simple-vars@^7.0.1:
+  version "7.0.1"
+  resolved "https://registry.yarnpkg.com/postcss-simple-vars/-/postcss-simple-vars-7.0.1.tgz#836b3097a54dcd13dbd3c36a5dbdd512fad2954c"
+  integrity sha512-5GLLXaS8qmzHMOjVxqkk1TZPf1jMqesiI7qLhnlyERalG0sMbHIbJqrcnrpmZdKCLglHnRHoEBB61RtGTsj++A==
 
 postcss-sorting@^7.0.1:
   version "7.0.1"