build: update portfinder to version 1.0.20

Author: renovate-bot

packages/angular_devkit/build_angular/package.json

@@ -29,7 +29,7 @@
     "minimatch": "3.0.4",
     "parse5": "4.0.0",
     "opn": "5.4.0",
-    "portfinder": "1.0.17",
+    "portfinder": "1.0.20",
     "postcss": "7.0.7",
     "postcss-import": "12.0.0",
     "postcss-loader": "3.0.0",

yarn.lock

@@ -7503,10 +7503,10 @@ popper.js@^1.14.1:
   resolved "https://registry.yarnpkg.com/popper.js/-/popper.js-1.14.4.tgz#8eec1d8ff02a5a3a152dd43414a15c7b79fd69b6"
   integrity sha1-juwdj/AqWjoVLdQ0FKFce3n9abY=
 
-portfinder@1.0.17:
-  version "1.0.17"
-  resolved "https://registry.yarnpkg.com/portfinder/-/portfinder-1.0.17.tgz#a8a1691143e46c4735edefcf4fbcccedad26456a"
-  integrity sha512-syFcRIRzVI1BoEFOCaAiizwDolh1S1YXSodsVhncbhjzjZQulhczNRbqnUl9N31Q4dKGOXsNDqxC2BWBgSMqeQ==
+portfinder@1.0.20:
+  version "1.0.20"
+  resolved "https://registry.yarnpkg.com/portfinder/-/portfinder-1.0.20.tgz#bea68632e54b2e13ab7b0c4775e9b41bf270e44a"
+  integrity sha512-Yxe4mTyDzTd59PZJY4ojZR8F+E5e97iq2ZOHPz3HDgSvYC5siNad2tLooQ5y5QHyQhc3xVqvyk/eNA3wuoa7Sw==
   dependencies:
     async "^1.5.2"
     debug "^2.2.0"