Bump expect from 25.3.0 to 26.4.1

Bumps [expect](https://github.com/facebook/jest/tree/HEAD/packages/expect) from 25.3.0 to 26.4.1.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/commits/v26.4.1/packages/expect)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -29,7 +29,7 @@
     "chai": "^4.2.0",
     "coveralls": "^3.0.4",
     "event-stream": "^4.0.1",
-    "expect": "^25.2.7",
+    "expect": "^26.4.1",
     "gulp-util": "^3.0.8",
     "lodash": "^4.17.14",
     "lodash.template": "^4.5.0",