build: update rollup to version 2.9.1

Author: renovate-bot

packages/angular_devkit/build_angular/package.json

@@ -50,7 +50,7 @@
     "regenerator-runtime": "0.13.5",
     "resolve-url-loader": "3.1.1",
     "rimraf": "3.0.2",
-    "rollup": "2.8.2",
+    "rollup": "2.9.1",
     "rxjs": "6.5.5",
     "sass": "1.26.5",
     "sass-loader": "8.0.2",

yarn.lock

@@ -10557,10 +10557,10 @@ [email protected]:
   optionalDependencies:
     fsevents "~2.1.2"
 
-rollup@2.8.2:
-  version "2.8.2"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.8.2.tgz#08427a8eb118e6e4ac8d80eba22774bc1d059c81"
-  integrity sha512-LRzMcB8V1M69pSvf6uCbR+W9OPCy5FuxcIwqioWg5RKidrrqKbzjJF9pEGXceaMVkbptNFZgIVJlUokCU0sfng==
+rollup@2.9.1:
+  version "2.9.1"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.9.1.tgz#3038ba1378e2ee614b5c9385b8379d7bec4c69ea"
+  integrity sha512-kEZn76R0j+WD4AActu5Np4RShNlewTtJhdUaWNtHwHnAA8AOapyXgH6O7NL2RkcQLHnl49oz1xW1VrDcu5yP+Q==
   optionalDependencies:
     fsevents "~2.1.2"