Update dependency chai to v6

Author: renovate[bot]

package.json

@@ -9,7 +9,7 @@
     "@wdio/local-runner": "7.8.0",
     "@wdio/mocha-framework": "7.8.0",
     "@wdio/sync": "7.8.0",
-    "chai": "4.3.4",
+    "chai": "6.2.1",
     "chromedriver": "90.0.1",
     "mocha": "8.4.0",
     "ts-node": "9.1.1",