fix: packages/react-scripts/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BRACES-6838727
- https://snyk.io/vuln/SNYK-JS-UNSETVALUE-2400660
- https://snyk.io/vuln/SNYK-JS-MICROMATCH-6838728

Author: snyk-io[bot]

packages/react-scripts/package.json

@@ -58,7 +58,7 @@
     "fs-extra": "^9.0.1",
     "html-webpack-plugin": "4.5.0",
     "identity-obj-proxy": "3.0.0",
-    "jest": "26.6.0",
+    "jest": "27.0.0",
     "jest-circus": "26.6.0",
     "jest-resolve": "26.6.0",
     "jest-watch-typeahead": "0.6.1",