Bump chai from 5.0.3 to 5.1.0

Bumps [chai](https://github.com/chaijs/chai) from 5.0.3 to 5.1.0.
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/main/History.md)
- [Commits](https://github.com/chaijs/chai/compare/v5.0.3...v5.1.0)

---
updated-dependencies:
- dependency-name: chai
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

plugins/plugin-theme/package.json

@@ -54,7 +54,7 @@
   "dependencies": {},
   "devDependencies": {
     "mocha": "10.3.0",
-    "chai": "5.0.3"
+    "chai": "5.1.0"
   },
   "files": [
     "dist/*",