⬆️ Upgrade some dependencies

packages/nodes-base/package.json

@@ -376,7 +376,7 @@
     "@types/formidable": "^1.0.31",
     "@types/gm": "^1.18.2",
     "@types/imap-simple": "^4.2.0",
-    "@types/jest": "^25.2.1",
+    "@types/jest": "^26.0.13",
     "@types/lodash.set": "^4.3.6",
     "@types/mailparser": "^2.7.3",
     "@types/moment-timezone": "^0.5.12",
@@ -391,9 +391,9 @@
     "@types/uuid": "^3.4.6",
     "@types/xml2js": "^0.4.3",
     "gulp": "^4.0.0",
-    "jest": "^24.9.0",
+    "jest": "^26.4.2",
     "n8n-workflow": "~0.39.0",
-    "ts-jest": "^25.4.0",
+    "ts-jest": "^26.3.0",
     "tslint": "^6.1.2",
     "typescript": "~3.7.4"
   },