build(deps-dev): bump rollup from 2.20.0 to 2.21.0 (#1545)

Bumps [rollup](https://github.com/rollup/rollup) from 2.20.0 to 2.21.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v2.20.0...v2.21.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

yarn.lock

@@ -6202,9 +6202,9 @@ rollup-pluginutils@^2.3.1:
     estree-walker "^0.6.1"
 
 rollup@^2.16.1:
-  version "2.20.0"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.20.0.tgz#7456fed8424a5247954958751642e9fdd0ad7485"
-  integrity sha512-hkbp//ne1om8+PQRpd81zk0KDvbJxkLZdZJh1ZNxjd1EkI0H1TmYuHqqXx88yciS+5YnMom3geubQjTeeUnNNw==
+  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"