chore(deps): update dependency @types/jest to v26.0.20

Author: renovate-bot

package.json

@@ -34,7 +34,7 @@
     "@nrwl/jest": "10.0.11",
     "@nrwl/nx-plugin": "10.0.11",
     "@nrwl/workspace": "10.0.11",
-    "@types/jest": "26.0.9",
+    "@types/jest": "26.0.20",
     "@types/node": "8.10.66",
     "@typescript-eslint/eslint-plugin": "3.9.0",
     "@typescript-eslint/parser": "3.9.0",