chore(deps-dev): bump @types/jest from 25.2.3 to 26.0.7

Bumps [@types/jest](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/jest) from 25.2.3 to 26.0.7.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/jest)

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

plugins/graphiql/package.json

@@ -50,7 +50,7 @@
     "@testing-library/react": "^10.4.1",
     "@testing-library/user-event": "^12.0.7",
     "@types/codemirror": "^0.0.96",
-    "@types/jest": "^25.2.2",
+    "@types/jest": "^26.0.7",
     "@types/node": "^12.0.0",
     "jest-fetch-mock": "^3.0.3",
     "react-router-dom": "6.0.0-beta.0"