Increase default timeout from 5s to 10s

It seems Chrome launch times have become spotty, at least via
GitHub Actions. Almost every push, one or two of the six builds
fails in a timeout (3 Node.js versions, times 2 OS versions).

Author: Krinkle

tasks/qunit.js

@@ -261,7 +261,7 @@ module.exports = function(grunt) {
     // Merge task-specific and/or target-specific options with these defaults.
     options = this.options({
       // Default Chrome timeout.
-      timeout: 5000,
+      timeout: 10000,
       // QUnit-Chrome bridge file to be injected.
       inject: asset('chrome/bridge.js'),
       // Explicit non-file URLs to test.