build: update postcss to version 7.0.26

Author: renovate-bot

packages/angular_devkit/build_angular/package.json

@@ -40,7 +40,7 @@
     "minimatch": "3.0.4",
     "parse5": "4.0.0",
     "open": "7.0.0",
-    "postcss": "7.0.25",
+    "postcss": "7.0.26",
     "postcss-import": "12.0.1",
     "postcss-loader": "3.0.0",
     "raw-loader": "4.0.0",

yarn.lock

@@ -8495,10 +8495,10 @@ postcss-value-parser@^4.0.2:
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-4.0.2.tgz#482282c09a42706d1fc9a069b73f44ec08391dc9"
   integrity sha512-LmeoohTpp/K4UiyQCwuGWlONxXamGzCMtFxLq4W1nZVGIQLYvMCJx3yAF9qyyuFpflABI9yVdtJAqbihOsCsJQ==
 
-[email protected].25:
-  version "7.0.25"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.25.tgz#dd2a2a753d50b13bed7a2009b4a18ac14d9db21e"
-  integrity sha512-NXXVvWq9icrm/TgQC0O6YVFi4StfJz46M1iNd/h6B26Nvh/HKI+q4YZtFN/EjcInZliEscO/WL10BXnc1E5nwg==
+[email protected].26:
+  version "7.0.26"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.26.tgz#5ed615cfcab35ba9bbb82414a4fa88ea10429587"
+  integrity sha512-IY4oRjpXWYshuTDFxMVkJDtWIk2LhsTlu8bZnbEJA4+bYT16Lvpo8Qv6EvDumhYRgzjZl489pmsY3qVgJQ08nA==
   dependencies:
     chalk "^2.4.2"
     source-map "^0.6.1"