Update dependency mocha to v8.4.0 (#6595)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package.json

@@ -1149,7 +1149,7 @@
     "gulp-tslint": "8.1.4",
     "gulp-typescript": "5.0.1",
     "minimist": "1.2.5",
-    "mocha": "8.3.2",
+    "mocha": "8.4.0",
     "plugin-error": "1.0.1",
     "prettier": "2.2.1",
     "sinon": "10.0.0",

yarn.lock

@@ -4014,10 +4014,10 @@ mixin-deep@^1.2.0:
   dependencies:
     minimist "^1.2.5"
 
-mocha@8.3.2:
-  version "8.3.2"
-  resolved "https://registry.yarnpkg.com/mocha/-/mocha-8.3.2.tgz#53406f195fa86fbdebe71f8b1c6fb23221d69fcc"
-  integrity sha512-UdmISwr/5w+uXLPKspgoV7/RXZwKRTiTjJ2/AC5ZiEztIoOYdfKb19+9jNmEInzx5pBsCyJQzarAxqIGBNYJhg==
+mocha@8.4.0:
+  version "8.4.0"
+  resolved "https://registry.yarnpkg.com/mocha/-/mocha-8.4.0.tgz#677be88bf15980a3cae03a73e10a0fc3997f0cff"
+  integrity sha512-hJaO0mwDXmZS4ghXsvPVriOhsxQ7ofcpQdm8dE+jISUOKopitvnXFQmpRR7jd2K6VBG6E26gU3IAbXXGIbu4sQ==
   dependencies:
     "@ungap/promise-all-settled" "1.1.2"
     ansi-colors "4.1.1"