Update dependency karma to v6

Author: renovate-bot

integration/firebase/package.json

@@ -11,7 +11,7 @@
     "@types/chai": "4.2.14",
     "@types/mocha": "7.0.2",
     "chai": "4.2.0",
-    "karma": "5.2.3",
+    "karma": "6.1.0",
     "karma-babel-preprocessor": "8.0.1",
     "karma-chrome-launcher": "3.1.0",
     "karma-firefox-launcher": "2.1.0",

integration/firestore/package.json

@@ -20,7 +20,7 @@
     "gulp": "4.0.2",
     "gulp-filter": "6.0.0",
     "gulp-replace": "1.0.0",
-    "karma": "5.2.3",
+    "karma": "6.1.0",
     "karma-chrome-launcher": "3.1.0",
     "karma-firefox-launcher": "2.1.0",
     "karma-mocha": "2.0.1",

package.json

@@ -115,7 +115,7 @@
     "inquirer": "7.3.3",
     "istanbul-instrumenter-loader": "3.0.1",
     "js-yaml": "4.0.0",
-    "karma": "5.2.3",
+    "karma": "6.1.0",
     "karma-chrome-launcher": "3.1.0",
     "karma-cli": "2.0.0",
     "karma-coverage-istanbul-reporter": "2.1.1",