Bump @types/jest from 26.0.20 to 26.0.21 (#786)

Bumps [@types/jest](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/jest) from 26.0.20 to 26.0.21.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/jest)

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package.json

@@ -41,7 +41,7 @@
     "@types/expect-puppeteer": "4.4.5",
     "@types/express": "4.17.11",
     "@types/http-errors": "1.8.0",
-    "@types/jest": "26.0.20",
+    "@types/jest": "26.0.21",
     "@types/jest-environment-puppeteer": "4.4.1",
     "@types/jest-image-snapshot": "4.3.0",
     "@types/morgan": "1.9.2",