Bump esbuild from 0.20.2 to 0.21.3

Bumps [esbuild](https://github.com/evanw/esbuild) from 0.20.2 to 0.21.3.
- [Release notes](https://github.com/evanw/esbuild/releases)
- [Changelog](https://github.com/evanw/esbuild/blob/main/CHANGELOG.md)
- [Commits](evanw/esbuild@v0.20.2...v0.21.3)

---
updated-dependencies:
- dependency-name: esbuild
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -3,7 +3,7 @@
     "@atlaskit/editor-json-transformer": "^8.11.1",
     "@atlaskit/editor-markdown-transformer": "^5.5.1",
     "@atlaskit/editor-wikimarkup-transformer": "^11.3.0",
-    "esbuild": "^0.20.2"
+    "esbuild": "^0.21.3"
   },
   "scripts": {
     "build": "esbuild atlaskit-transformer.js --bundle --platform=node --outfile=nbdev_squ/atlaskit-transformer.bundle.js"