build: update rollup to version 2.21.0

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": "2.20.0",
+    "rollup": "2.21.0",
     "rxjs": "6.6.0",
     "sass": "1.26.10",
     "sass-loader": "9.0.1",

yarn.lock

@@ -11554,10 +11554,10 @@ rollup-plugin-sourcemaps@^0.6.0:
     "@rollup/pluginutils" "^3.0.9"
     source-map-resolve "^0.6.0"
 
-rollup@2.20.0:
-  version "2.20.0"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.20.0.tgz#7456fed8424a5247954958751642e9fdd0ad7485"
-  integrity sha512-hkbp//ne1om8+PQRpd81zk0KDvbJxkLZdZJh1ZNxjd1EkI0H1TmYuHqqXx88yciS+5YnMom3geubQjTeeUnNNw==
+rollup@2.21.0:
+  version "2.21.0"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.21.0.tgz#d2e114533812043d5c9b7b0a83f1b2a242e4e1d6"
+  integrity sha512-BEGgy+wSzux7Ycq58pRiWEOBZaXRXTuvzl1gsm7gqmsAHxkWf9nyA5V2LN9fGSHhhDQd0/C13iRzSh4bbIpWZQ==
   optionalDependencies:
     fsevents "~2.1.2"