Bump esbuild from 0.21.4 to 0.21.5 (#6445)

Bumps [esbuild](https://github.com/evanw/esbuild) from 0.21.4 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/v0.21.4...v0.21.5)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/package.json

@@ -36,7 +36,7 @@
     "cookie-parser": "^1.4.6",
     "cross-spawn": "^7.0.3",
     "ejs": "^3.1.10",
-    "esbuild": "^0.21.4",
+    "esbuild": "^0.21.5",
     "etherpad-require-kernel": "^1.0.16",
     "etherpad-yajsml": "0.0.12",
     "express": "4.19.2",