Update dependency @types/jest to v26.0.20 (#131)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

package-lock.json

@@ -96,7 +96,7 @@
     "aws-sdk": "^2.681.0"
   },
   "devDependencies": {
-    "@types/jest": "26.0.19",
+    "@types/jest": "26.0.20",
     "@types/node": "13.13.38",
     "@typescript-eslint/eslint-plugin": "4.16.1",
     "@typescript-eslint/parser": "4.16.1",