build: update dependency postcss-import to v15

Author: angular-robot

package.json

@@ -186,7 +186,7 @@
     "piscina": "3.2.0",
     "popper.js": "^1.14.1",
     "postcss": "8.4.16",
-    "postcss-import": "14.1.0",
+    "postcss-import": "15.0.0",
     "postcss-loader": "7.0.1",
     "postcss-preset-env": "7.8.0",
     "prettier": "^2.0.0",

packages/angular_devkit/build_angular/package.json

@@ -46,7 +46,7 @@
     "parse5-html-rewriting-stream": "6.0.1",
     "piscina": "3.2.0",
     "postcss": "8.4.16",
-    "postcss-import": "14.1.0",
+    "postcss-import": "15.0.0",
     "postcss-loader": "7.0.1",
     "postcss-preset-env": "7.8.0",
     "regenerator-runtime": "0.13.9",

yarn.lock

@@ -8671,6 +8671,15 @@ [email protected]:
     read-cache "^1.0.0"
     resolve "^1.1.7"
 
+[email protected]:
+  version "15.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-import/-/postcss-import-15.0.0.tgz#0b66c25fdd9c0d19576e63c803cf39e4bad08822"
+  integrity sha512-Y20shPQ07RitgBGv2zvkEAu9bqvrD77C9axhj/aA1BQj4czape2MdClCExvB27EwYEJdGgKZBpKanb0t1rK2Kg==
+  dependencies:
+    postcss-value-parser "^4.0.0"
+    read-cache "^1.0.0"
+    resolve "^1.1.7"
+
 postcss-initial@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/postcss-initial/-/postcss-initial-4.0.1.tgz#529f735f72c5724a0fb30527df6fb7ac54d7de42"