chore(deps): update dependency @types/chai to v4.2.6

Author: renovate-bot

package.json

@@ -42,7 +42,7 @@
     "@sourcegraph/prettierrc": "^3.0.1",
     "@sourcegraph/tsconfig": "^4.0.0",
     "@sourcegraph/tslint-config": "^13.4.0",
-    "@types/chai": "4.2.5",
+    "@types/chai": "4.2.6",
     "@types/fs-extra": "7.0.0",
     "@types/karma": "3.0.4",
     "@types/karma-webpack": "2.0.7",

yarn.lock

@@ -420,10 +420,10 @@
   resolved "https://registry.yarnpkg.com/@types/bluebird/-/bluebird-3.5.24.tgz#11f76812531c14f793b8ecbf1de96f672905de8a"
   integrity sha512-YeQoDpq4Lm8ppSBqAnAeF/xy1cYp/dMTif2JFcvmAbETMRlvKHT2iLcWu+WyYiJO3b3Ivokwo7EQca/xfLVJmg==
 
-"@types/[email protected].5":
-  version "4.2.5"
-  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.5.tgz#f8da153ebbe30babb0adc9a528b9ad32be3175a2"
-  integrity sha512-YvbLiIc0DbbhiANrfVObdkLEHJksQZVq0Uvfg550SRAKVYaEJy+V70j65BVe2WNp6E3HtKsUczeijHFCjba3og==
+"@types/[email protected].6":
+  version "4.2.6"
+  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.6.tgz#a55625d151d9c7c7a0a95920632131d66480bce9"
+  integrity sha512-HF8faEUA4JurIm+68VaA2KedtZf5LYdXpQEAbIAN79DwWQbO82BNTksZgCH3UMqbZHXex9C6TrBfg7OUInRISQ==
 
 "@types/connect@*":
   version "3.4.32"