Bump jest from 25.5.4 to 26.1.0 (#318)

Bumps [jest](https://github.com/facebook/jest) from 25.5.4 to 26.1.0.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/compare/v25.5.4...v26.1.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -60,7 +60,7 @@
     "gulp-postcss": "^8.0.0",
     "gulp-sass": "^4.0.0",
     "gulp-shell": "^0.8.0",
-    "jest": "^25.1.0",
+    "jest": "^26.1.0",
     "rollup": "^2.2.0",
     "rollup-plugin-babel": "^4.0.3",
     "rollup-plugin-commonjs": "^10.0.0",