chore(deps): update dependency @types/chai to v4.2.9

Author: renovate-bot

package.json

@@ -42,7 +42,7 @@
     "@sourcegraph/prettierrc": "^3.0.2",
     "@sourcegraph/tsconfig": "^4.0.0",
     "@sourcegraph/tslint-config": "^13.4.0",
-    "@types/chai": "4.2.8",
+    "@types/chai": "4.2.9",
     "@types/fs-extra": "7.0.0",
     "@types/karma": "3.0.6",
     "@types/karma-webpack": "2.0.7",

yarn.lock

@@ -427,10 +427,10 @@
   resolved "https://registry.yarnpkg.com/@types/bluebird/-/bluebird-3.5.24.tgz#11f76812531c14f793b8ecbf1de96f672905de8a"
   integrity sha512-YeQoDpq4Lm8ppSBqAnAeF/xy1cYp/dMTif2JFcvmAbETMRlvKHT2iLcWu+WyYiJO3b3Ivokwo7EQca/xfLVJmg==
 
-"@types/[email protected].8":
-  version "4.2.8"
-  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.8.tgz#c8d645506db0d15f4aafd4dfa873f443ad87ea59"
-  integrity sha512-U1bQiWbln41Yo6EeHMr+34aUhvrMVyrhn9lYfPSpLTCrZlGxU4Rtn1bocX+0p2Fc/Jkd2FanCEXdw0WNfHHM0w==
+"@types/[email protected].9":
+  version "4.2.9"
+  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.9.tgz#194332625ed2ae914aef00b8d5ca3b77e7924cc6"
+  integrity sha512-NeXgZj+MFL4izGqA4sapdYzkzQG+MtGra9vhQ58dnmDY++VgJaRUws+aLVV5zRJCYJl/8s9IjMmhiUw1WsKSmw==
 
 "@types/color-name@^1.1.1":
   version "1.1.1"