chore(deps-dev): bump microbundle from 0.11.0 to 0.12.1

Bumps [microbundle](https://github.com/developit/microbundle) from 0.11.0 to 0.12.1.
- [Release notes](https://github.com/developit/microbundle/releases)
- [Commits](developit/microbundle@0.11.0...0.12.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -37,7 +37,7 @@
     "jest-mock-console": "^1.0.0",
     "lerna": "^3.14.1",
     "lint-staged": "10",
-    "microbundle": "^0.11.0",
+    "microbundle": "^0.12.1",
     "prettier": "^2.0.5",
     "react-test-renderer": "^16.8.6",
     "ts-jest": "^25.2.0"