Build: Fix Travis build on Node.js 15 with npm 7

The `grunt-karma` version we used required Karma 3.x and it's now enforced
in npm 7. Update a few Karma & Grunt-related packages to resolve the issue.

Closes gh-4810

package.json

@@ -23,14 +23,13 @@
  "url": "https://github.com/jquery/jquery/issues"
  },
  "license": "MIT",
- "dependencies": {},
  "devDependencies": {
  "@babel/core": "7.3.3",
  "@babel/plugin-transform-for-of": "7.2.0",
  "commitplease": "3.2.0",
  "core-js": "2.6.5",
  "eslint-config-jquery": "3.0.0",
- "grunt": "1.0.3",
+ "grunt": "1.3.0",
  "grunt-babel": "8.0.0",
  "grunt-cli": "1.3.2",
  "grunt-compare-size": "0.4.2",
@@ -39,21 +38,21 @@
  "grunt-eslint": "22.0.0",
  "grunt-git-authors": "3.2.0",
  "grunt-jsonlint": "1.1.0",
- "grunt-karma": "3.0.1",
+ "grunt-karma": "4.0.0",
  "grunt-newer": "1.3.0",
- "grunt-npmcopy": "0.1.0",
+ "grunt-npmcopy": "0.2.0",
  "gzip-js": "0.3.2",
  "husky": "1.3.1",
  "insight": "0.10.1",
  "jsdom": "13.2.0",
- "karma": "4.0.1",
+ "karma": "5.2.3",
  "karma-browserstack-launcher": "1.4.0",
  "karma-chrome-launcher": "2.2.0",
  "karma-firefox-launcher": "1.1.0",
  "karma-ie-launcher": "1.0.0",
- "karma-jsdom-launcher": "7.1.0",
+ "karma-jsdom-launcher": "8.0.2",
  "karma-qunit": "3.0.0",
- "load-grunt-tasks": "4.0.0",
+ "load-grunt-tasks": "5.1.0",
  "native-promise-only": "0.8.1",
  "promises-aplus-tests": "2.1.2",
  "q": "1.5.1",
@@ -63,7 +62,7 @@
  "sinon": "2.3.7",
  "sizzle": "2.3.5",
  "strip-json-comments": "2.0.1",
- "testswarm": "1.1.0",
+ "testswarm": "1.1.2",
  "uglify-js": "3.4.7"
  },
  "scripts": {