Bump babel-jest from 25.3.0 to 26.3.0

Bumps [babel-jest](https://github.com/facebook/jest/tree/HEAD/packages/babel-jest) from 25.3.0 to 26.3.0.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/commits/v26.3.0/packages/babel-jest)

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

package.json

@@ -39,7 +39,7 @@
   "devDependencies": {
     "@babel/core": "7.9.0",
     "@babel/preset-env": "7.9.5",
-    "babel-jest": "25.3.0",
+    "babel-jest": "26.3.0",
     "copy-webpack-plugin": "5.1.1",
     "coveralls": "3.0.11",
     "css-loader": "3.4.2",