Bump chai from 4.5.0 to 5.1.2

Bumps [chai](https://github.com/chaijs/chai) from 4.5.0 to 5.1.2.
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/main/History.md)
- [Commits](chaijs/chai@v4.5.0...v5.1.2)

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

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

package.json

@@ -35,7 +35,7 @@
     "babel-plugin-transform-custom-element-classes": "^0.1.0",
     "babel-preset-es2015": "^6.24.1",
     "babel-preset-flow": "^6.23.0",
-    "chai": "^4.2.0",
+    "chai": "^5.1.2",
     "eslint": "^7.2.0",
     "eslint-plugin-github": "1.6.0",
     "eslint-plugin-relay": "^1.8.3",