chore(deps): update dependency rollup to v3

Author: renovate[bot]

apps/lit/package.json

@@ -46,7 +46,7 @@
     "mocha": "^6.2.2",
     "prettier": "^2.0.0",
     "rimraf": "^4.0.0",
-    "rollup": "^1.27.13",
+    "rollup": "^3.0.0",
     "rollup-plugin-filesize": "^10.0.0",
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-terser": "^7.0.0",