Bump @types/jest from 26.0.15 to 26.0.20 (#280)

Bumps [@types/jest](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/jest) from 26.0.15 to 26.0.20.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/jest)

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package.json

@@ -35,7 +35,7 @@
     "semver": "^7.3.4"
   },
   "devDependencies": {
-    "@types/jest": "^26.0.15",
+    "@types/jest": "^26.0.20",
     "@types/lodash.deburr": "^4.1.6",
     "@types/node": "^14.14.21",
     "@types/semver": "^7.3.4",