Bump react-devtools-core from 4.24.7 to 4.28.4 in /example (#23)

Bumps [react-devtools-core](https://github.com/facebook/react/tree/HEAD/packages/react-devtools-core) from 4.24.7 to 4.28.4.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/HEAD/packages/react-devtools-core)

---
updated-dependencies:
- dependency-name: react-devtools-core
  dependency-type: indirect
...

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example/yarn.lock

@@ -3766,9 +3766,9 @@ range-parser@~1.2.1:
   integrity sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==
 
 react-devtools-core@^4.23.0:
-  version "4.24.7"
-  resolved "https://registry.yarnpkg.com/react-devtools-core/-/react-devtools-core-4.24.7.tgz#43df22e6d244ed8286fd3ff16a80813998fe82a0"
-  integrity sha512-OFB1cp8bsh5Kc6oOJ3ZzH++zMBtydwD53yBYa50FKEGyOOdgdbJ4VsCsZhN/6F5T4gJfrZraU6EKda8P+tMLtg==
+  version "4.28.4"
+  resolved "https://registry.yarnpkg.com/react-devtools-core/-/react-devtools-core-4.28.4.tgz#fb8183eada77093f4c2f9830e664bf22255abe27"
+  integrity sha512-IUZKLv3CimeM07G3vX4H4loxVpByrzq3HvfTX7v9migalwvLs9ZY5D3S3pKR33U+GguYfBBdMMZyToFhsSE/iQ==
   dependencies:
     shell-quote "^1.6.1"
     ws "^7"