chore(deps): update dependency mocha to v7

Author: renovate-bot

package.json

@@ -58,12 +58,12 @@
     "@sourcegraph/tsconfig": "^4.0.0",
     "@sourcegraph/tslint-config": "^13.3.0",
     "@types/lodash": "4.14.149",
-    "@types/mocha": "5.2.7",
+    "@types/mocha": "7.0.1",
     "@types/mock-require": "2.0.0",
     "@types/sinon": "7.0.13",
     "@types/uuid": "3.4.5",
     "husky": "^1.3.1",
-    "mocha": "^6.0.0",
+    "mocha": "^7.0.1",
     "mock-require": "^3.0.3",
     "nyc": "^13.1.0",
     "prettier": "^1.19.1",