chore(deps-dev): bump @types/jest from 26.0.19 to 26.0.20

Bumps [@types/jest](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/jest) from 26.0.19 to 26.0.20.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/jest)

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

package.json

@@ -30,7 +30,7 @@
     "@actions/tool-cache": "^1.6.1"
   },
   "devDependencies": {
-    "@types/jest": "^26.0.19",
+    "@types/jest": "^26.0.20",
     "@types/node": "^14.14.20",
     "@typescript-eslint/parser": "^4.12.0",
     "@vercel/ncc": "^0.26.2",