Update dependency postcss-import to v12

Author: renovate-bot

package.json

@@ -69,7 +69,7 @@
     "poi": "^10.1.5",
     "postcss-color-function": "4.0.1",
     "postcss-cssnext": "3.1.0",
-    "postcss-import": "11.1.0",
+    "postcss-import": "12.0.0",
     "postcss-media-minmax": "3.0.0",
     "postcss-nested": "3.0.0",
     "rimraf": "2.6.2",

yarn.lock

@@ -3272,7 +3272,7 @@ chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0, chalk@^2.3.0, chalk@^2.3.1:
     escape-string-regexp "^1.0.5"
     supports-color "^5.2.0"
 
-chalk@^2.3.2:
+chalk@^2.3.2, chalk@^2.4.1:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.1.tgz#18c49ab16a037b6eb0152cc83e3471338215b66e"
   dependencies:
@@ -8508,11 +8508,11 @@ postcss-image-set-polyfill@^0.3.5:
     postcss "^6.0.1"
     postcss-media-query-parser "^0.2.3"
 
-postcss-import@11.1.0:
-  version "11.1.0"
-  resolved "https://registry.yarnpkg.com/postcss-import/-/postcss-import-11.1.0.tgz#55c9362c9192994ec68865d224419df1db2981f0"
+postcss-import@12.0.0:
+  version "12.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-import/-/postcss-import-12.0.0.tgz#149f96a4ef0b27525c419784be8517ebd17e92c5"
   dependencies:
-    postcss "^6.0.1"
+    postcss "^7.0.1"
     postcss-value-parser "^3.2.3"
     read-cache "^1.0.0"
     resolve "^1.1.7"
@@ -8889,6 +8889,14 @@ postcss@^6.0, postcss@^6.0.0, postcss@^6.0.1, postcss@^6.0.11, postcss@^6.0.14,
     source-map "^0.6.1"
     supports-color "^5.2.0"
 
+postcss@^7.0.1:
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.2.tgz#7b5a109de356804e27f95a960bef0e4d5bc9bb18"
+  dependencies:
+    chalk "^2.4.1"
+    source-map "^0.6.1"
+    supports-color "^5.4.0"
+
 posthtml-attrs-parser@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/posthtml-attrs-parser/-/posthtml-attrs-parser-0.1.1.tgz#cc33e00155fb99ba96f67e25e330461f05742ac8"
@@ -10789,7 +10797,7 @@ supports-color@^4.2.1:
   dependencies:
     has-flag "^2.0.0"
 
-supports-color@^5.1.0, supports-color@^5.3.0:
+supports-color@^5.1.0, supports-color@^5.3.0, supports-color@^5.4.0:
   version "5.4.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.4.0.tgz#1c6b337402c2137605efe19f10fec390f6faab54"
   dependencies: