Upgrade: Bump jest from 25.1.0 to 26.1.0

Bumps [jest](https://github.com/facebook/jest) from 25.1.0 to 26.1.0.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](jestjs/jest@v25.1.0...v26.1.0)

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

Author: dependabot-preview[bot]

package.json

@@ -79,7 +79,7 @@
     "express": "^4.17.1",
     "file-loader": "^6.0.0",
     "html-webpack-plugin": "^4.3.0",
-    "jest": "^25.1.0",
+    "jest": "^26.1.0",
     "mini-css-extract-plugin": "^0.9.0",
     "node-sass": "^4.14.1",
     "open": "^7.0.4",