chore(deps): update dependency mocha to v7 (googleapis#1926)

Author: renovate-bot

package.json

@@ -76,7 +76,7 @@
     "linkinator": "^1.5.0",
     "minimist": "^1.2.0",
     "mkdirp": "^0.5.1",
-    "mocha": "^6.2.2",
+    "mocha": "^7.0.0",
     "mv": "^2.1.1",
     "ncp": "^2.0.0",
     "nock": "^11.3.2",

samples/package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "chai": "^4.2.0",
     "execa": "^4.0.0",
-    "mocha": "^6.2.2",
+    "mocha": "^7.0.0",
     "nock": "^11.7.0"
   }
 }