Update dependency postcss to v8.4.19

package.json

@@ -56,7 +56,7 @@
         "gulp-util": "3.0.8",
         "gulp-watch": "5.0.1",
         "gulp-zip": "5.1.0",
-        "postcss": "8.4.18",
+        "postcss": "8.4.19",
         "postcss-color-function": "4.1.0",
         "postcss-custom-properties": "11.0.0",
         "postcss-easy-import": "3.0.0"

yarn.lock

@@ -4017,10 +4017,10 @@ postcss-values-parser@^4.0.0:
     is-url-superb "^4.0.0"
     postcss "^7.0.5"
 
-[email protected].18:
-  version "8.4.18"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.18.tgz#6d50046ea7d3d66a85e0e782074e7203bc7fbca2"
-  integrity sha512-Wi8mWhncLJm11GATDaQKobXSNEYGUHeQLiQqDFG1qQ5UTDPTEvKw0Xt5NsTpktGTwLps3ByrWsBrG0rB8YQ9oA==
+[email protected].19:
+  version "8.4.19"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.19.tgz#61178e2add236b17351897c8bcc0b4c8ecab56fc"
+  integrity sha512-h+pbPsyhlYj6N2ozBmHhHrs9DzGmbaarbLvWipMRO7RLS+v4onj26MPFXA5OBYFxyqYhUJK456SwDcY9H2/zsA==
   dependencies:
     nanoid "^3.3.4"
     picocolors "^1.0.0"