chore(deps): update dependency @types/chai to v4.2.21

Author: renovate-bot

package.json

@@ -18,7 +18,7 @@
     "@oclif/test": "1.2.8",
     "@salesforce/dev-config": "1.6.0",
     "@salesforce/ts-sinon": "1.3.12",
-    "@types/chai": "4.2.18",
+    "@types/chai": "4.2.21",
     "@types/chai-as-promised": "7.1.4",
     "@types/mocha": "5.2.7",
     "@types/mock-fs": "4.13.0",

yarn.lock

@@ -1478,10 +1478,10 @@
   resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.12.tgz#6160ae454cd89dae05adc3bb97997f488b608201"
   integrity sha512-aN5IAC8QNtSUdQzxu7lGBgYAOuU1tmRU4c9dIq5OKGf/SBVjXo+ffM2wEjudAWbgpOhy60nLoAGH1xm8fpCKFQ==
 
-"@types/chai@4.2.18":
-  version "4.2.18"
-  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.18.tgz#0c8e298dbff8205e2266606c1ea5fbdba29b46e4"
-  integrity sha512-rS27+EkB/RE1Iz3u0XtVL5q36MGDWbgYe7zWiodyKNUnthxY0rukK5V36eiUCtCisB7NN8zKYH6DO2M37qxFEQ==
+"@types/chai@4.2.21":
+  version "4.2.21"
+  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.2.21.tgz#9f35a5643129df132cf3b5c1ec64046ea1af0650"
+  integrity sha512-yd+9qKmJxm496BOV9CMNaey8TWsikaZOwMRwPHQIjcOJM9oV+fi9ZMNw3JsVnbEEbo2gRTDnGEBv8pjyn67hNg==
 
 "@types/color-name@^1.1.1":
   version "1.1.1"