build: update dependency postcss-loader to v7

Author: renovate-bot

package.json

@@ -182,7 +182,7 @@
     "popper.js": "^1.14.1",
     "postcss": "8.4.14",
     "postcss-import": "14.1.0",
-    "postcss-loader": "6.2.1",
+    "postcss-loader": "7.0.0",
     "postcss-preset-env": "7.6.0",
     "prettier": "^2.0.0",
     "protractor": "~7.0.0",

packages/angular_devkit/build_angular/package.json

@@ -47,7 +47,7 @@
     "piscina": "3.2.0",
     "postcss": "8.4.14",
     "postcss-import": "14.1.0",
-    "postcss-loader": "6.2.1",
+    "postcss-loader": "7.0.0",
     "postcss-preset-env": "7.6.0",
     "regenerator-runtime": "0.13.9",
     "resolve-url-loader": "5.0.0",

yarn.lock

@@ -8785,6 +8785,15 @@ postcss-loader@6.2.1:
     klona "^2.0.5"
     semver "^7.3.5"
 
+postcss-loader@7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-loader/-/postcss-loader-7.0.0.tgz#367d10eb1c5f1d93700e6b399683a6dc7c3af396"
+  integrity sha512-IDyttebFzTSY6DI24KuHUcBjbAev1i+RyICoPEWcAstZsj03r533uMXtDn506l6/wlsRYiS5XBdx7TpccCsyUg==
+  dependencies:
+    cosmiconfig "^7.0.0"
+    klona "^2.0.5"
+    semver "^7.3.7"
+
 postcss-logical@^5.0.4:
   version "5.0.4"
   resolved "https://registry.yarnpkg.com/postcss-logical/-/postcss-logical-5.0.4.tgz#ec75b1ee54421acc04d5921576b7d8db6b0e6f73"