build(deps-dev): bump chai from 4.3.8 to 4.3.9

Bumps [chai](https://github.com/chaijs/chai) from 4.3.8 to 4.3.9.
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/4.x.x/History.md)
- [Commits](chaijs/chai@v4.3.8...v4.3.9)

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

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

package.json

@@ -79,7 +79,7 @@
     "@rollup/plugin-babel": "^6.0.3",
     "@rollup/plugin-commonjs": "^25.0.4",
     "c8": "^8.0.1",
-    "chai": "^4.3.8",
+    "chai": "^4.3.9",
     "cross-env": "7.0.3",
     "jsdoc": "^4.0.2",
     "jsdoc-to-markdown": "^8.0.0",