chore(deps): update dependency @types/mocha to v8

Author: renovate-bot

package.json

@@ -120,7 +120,7 @@
     "@sourcegraph/eslint-config": "^0.20.8",
     "@sourcegraph/prettierrc": "^3.0.3",
     "@sourcegraph/tsconfig": "^4.0.1",
-    "@types/mocha": "7.0.2",
+    "@types/mocha": "8.2.2",
     "@types/node": "14.17.2",
     "@types/sinon": "10.0.2",
     "eslint": "^7.28.0",

yarn.lock

@@ -1207,10 +1207,10 @@
   resolved "https://registry.yarnpkg.com/@types/json5/-/json5-0.0.29.tgz#ee28707ae94e11d2b827bcbe5270bcea7f3e71ee"
   integrity sha1-7ihweulOEdK4J7y+UnC86n8+ce4=
 
-"@types/mocha@7.0.2":
-  version "7.0.2"
-  resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-7.0.2.tgz#b17f16cf933597e10d6d78eae3251e692ce8b0ce"
-  integrity sha512-ZvO2tAcjmMi8V/5Z3JsyofMe3hasRcaw88cto5etSVMwVQfeivGAlEYmaQgceUSVYFofVjT+ioHsATjdWcFt1w==
+"@types/mocha@8.2.2":
+  version "8.2.2"
+  resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-8.2.2.tgz#91daa226eb8c2ff261e6a8cbf8c7304641e095e0"
+  integrity sha512-Lwh0lzzqT5Pqh6z61P3c3P5nm6fzQK/MMHl9UKeneAeInVflBSz1O2EkX6gM6xfJd7FBXBY5purtLx7fUiZ7Hw==
 
 "@types/[email protected]":
   version "14.17.2"