build: update devdependency rollup to ~2.21.0 (#442)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package.json

@@ -47,7 +47,7 @@
     "eslint-config-wopian": "~2.0.0",
     "jest": "~26.1.0",
     "lerna": "~3.22.0",
-    "rollup": "~2.19.0",
+    "rollup": "~2.21.0",
     "rollup-plugin-delete": "~2.0.0",
     "rollup-plugin-local-resolve": "~1.0.7",
     "rollup-plugin-terser": "~6.1.0",

yarn.lock

@@ -10268,10 +10268,10 @@ rollup-plugin-terser@~6.1.0:
     serialize-javascript "^3.0.0"
     terser "^4.7.0"
 
-rollup@~2.19.0:
-  version "2.19.0"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.19.0.tgz#6484868882281552b0dc33aa5bc5b36a9c920452"
-  integrity sha512-nny5Vs4jwY3vbQAXgOyU4ZDZqLvMKm/umnsVry/demVL6ve8ke1XhdpYE0eiWencASmx/qFPw6pP8P7MLJl9XA==
+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"