Update dependency mini-css-extract-plugin to v2 (#7544)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

package.json

@@ -102,7 +102,7 @@
     "jest-environment-puppeteer": "6.0.3",
     "jest-puppeteer": "6.0.3",
     "markdownlint-cli": "0.32.2",
-    "mini-css-extract-plugin": "1.6.2",
+    "mini-css-extract-plugin": "2.6.1",
     "path": "0.12.7",
     "prettier": "2.0.5",
     "puppeteer": "8.0.0",

yarn.lock

@@ -7371,14 +7371,12 @@ mini-create-react-context@^0.3.0:
     "@babel/runtime" "^7.12.1"
     tiny-warning "^1.0.3"
 
-mini-css-extract-plugin@1.6.2:
-  version "1.6.2"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-1.6.2.tgz#83172b4fd812f8fc4a09d6f6d16f924f53990ca8"
-  integrity sha512-WhDvO3SjGm40oV5y26GjMJYjd2UMqrLAGKy5YS2/3QKJy2F7jgynuHTir/tgUUOiNQu5saXHdc8reo7YuhhT4Q==
+mini-css-extract-plugin@2.6.1:
+  version "2.6.1"
+  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-2.6.1.tgz#9a1251d15f2035c342d99a468ab9da7a0451b71e"
+  integrity sha512-wd+SD57/K6DiV7jIR34P+s3uckTRuQvx0tKPcvjFlrEylk6P4mQ2KSWk1hblj1Kxaqok7LogKOieygXqBczNlg==
   dependencies:
-    loader-utils "^2.0.0"
-    schema-utils "^3.0.0"
-    webpack-sources "^1.1.0"
+    schema-utils "^4.0.0"
 
 minimalistic-assert@^1.0.0, minimalistic-assert@^1.0.1:
   version "1.0.1"
@@ -9075,7 +9073,7 @@ schema-utils@^2.6.5:
     ajv "^6.12.4"
     ajv-keywords "^3.5.2"
 
-schema-utils@^3.0.0, schema-utils@^3.1.0, schema-utils@^3.1.1:
+schema-utils@^3.1.0, schema-utils@^3.1.1:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-3.1.1.tgz#bc74c4b6b6995c1d88f76a8b77bea7219e0c8281"
   integrity sha512-Y5PQxS4ITlC+EahLuXaY86TXfR7Dc5lw294alXOq86JAHCihAIZfqv8nNCWvaEJvaC51uN9hbLGeV0cFBdH+Fw==
@@ -9323,11 +9321,6 @@ sockjs@^0.3.24:
     uuid "^8.3.2"
     websocket-driver "^0.7.4"
 
-source-list-map@^2.0.0:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/source-list-map/-/source-list-map-2.0.1.tgz#3993bd873bfc48479cca9ea3a547835c7c154b34"
-  integrity sha512-qnQ7gVMxGNxsiL4lEuJwe/To8UnK7fAnmbGEEH8RpLouuKbeEm0lhbQVFIrNSuB+G7tVrAlVsZgETT5nljf+Iw==
-
 source-map-js@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/source-map-js/-/source-map-js-1.0.2.tgz#adbc361d9c62df380125e7f161f71c826f1e490c"
@@ -10572,14 +10565,6 @@ webpack-merge@5.8.0, webpack-merge@^5.7.3:
     clone-deep "^4.0.1"
     wildcard "^2.0.0"
 
-webpack-sources@^1.1.0:
-  version "1.4.3"
-  resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-1.4.3.tgz#eedd8ec0b928fbf1cbfe994e22d2d890f330a933"
-  integrity sha512-lgTS3Xhv1lCOKo7SA5TjKXMjpSM4sBjNV5+q2bqesbSPs5FjGmU6jjtBSkX9b4qW87vDIsCIlUPOEhbZrMdjeQ==
-  dependencies:
-    source-list-map "^2.0.0"
-    source-map "~0.6.1"
-
 webpack-sources@^3.2.3:
   version "3.2.3"
   resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-3.2.3.tgz#2d4daab8451fd4b240cc27055ff6a0c2ccea0cde"