chore(package): update @types/chai to version 4.2.9

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "@oclif/dev-cli": "^1.22.2",
     "@oclif/test": "^1.2.5",
     "@oclif/tslint": "^3.1.1",
-    "@types/chai": "^4.2.3",
+    "@types/chai": "^4.2.9",
     "@types/mocha": "^7.0.0",
     "@types/moment-timezone": "^0.5.12",
     "@types/node": "^13.1.0",