Bump microbundle from 0.12.2 to 0.12.3

Bumps [microbundle](https://github.com/developit/microbundle) from 0.12.2 to 0.12.3.
- [Release notes](https://github.com/developit/microbundle/releases)
- [Commits](developit/microbundle@0.12.2...0.12.3)

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

package.json

@@ -33,7 +33,7 @@
     "eslint-plugin-react-hooks": "4.0.6",
     "jest": "26.1.0",
     "jest-fetch-mock": "3.0.3",
-    "microbundle": "0.12.2",
+    "microbundle": "0.12.3",
     "parcel-bundler": "1.12.4",
     "prettier": "2.0.5",
     "react": "16.13.1",

yarn.lock

@@ -5568,10 +5568,10 @@ merge2@^1.2.3:
   resolved "https://registry.yarnpkg.com/merge2/-/merge2-1.3.0.tgz#5b366ee83b2f1582c48f87e47cf1a9352103ca81"
   integrity sha512-2j4DAdlBOkiSZIsaXk4mTE3sRS02yBHAtfy127xRV3bQUFqXkjHCHLW6Scv7DwNRbIWNHH8zpnz9zMaKXIdvYw==
 
-microbundle@0.12.2:
-  version "0.12.2"
-  resolved "https://registry.yarnpkg.com/microbundle/-/microbundle-0.12.2.tgz#3d79941291ef919dd280ecdffd4c8ee15ad394e3"
-  integrity sha512-6/48HlmDPq/Q1HyS5liFFSvcU0v8n8NROH3K1Z/saU+TRaxCe38eNNqZwjitOyTKilXqnp1yHEEjZGYWVvr7WQ==
+microbundle@0.12.3:
+  version "0.12.3"
+  resolved "https://registry.yarnpkg.com/microbundle/-/microbundle-0.12.3.tgz#6f43f1a7d0ad6258f4406e390340db4ad0312e1f"
+  integrity sha512-OcpBYPytJXOJsTfPjhL5p3nR0JXt0O9dH97K2k6gJ9etokmuRE4qoAfdnYfsUYLRHftCMJu/BkbQySAPnQ87PQ==
   dependencies:
     "@babel/core" "^7.10.2"
     "@babel/plugin-proposal-class-properties" "7.7.4"