chore(deps-dev): bump esbuild from 0.21.3 to 0.21.5

Bumps [esbuild](https://github.com/evanw/esbuild) from 0.21.3 to 0.21.5.
- [Release notes](https://github.com/evanw/esbuild/releases)
- [Changelog](https://github.com/evanw/esbuild/blob/main/CHANGELOG.md)
- [Commits](https://github.com/evanw/esbuild/compare/v0.21.3...v0.21.5)

---
updated-dependencies:
- dependency-name: esbuild
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

sites/backend/package.json

@@ -49,7 +49,7 @@
   "devDependencies": {
     "chai": "5.1.1",
     "chai-http": "4.4.0",
-    "esbuild": "0.21.3",
+    "esbuild": "0.21.5",
     "mocha": "10.4.0",
     "mocha-steps": "1.3.0",
     "nodemon": "3.1.3",