Update dependency jest to v26 (#1893)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

package.json

@@ -57,7 +57,7 @@
     "eslint-plugin-node": "6.0.1",
     "faucet": "0.0.1",
     "htmllint-cli": "0.0.7",
-    "jest": "24.9.0",
+    "jest": "26.4.2",
     "jest-tap-reporter": "1.9.0",
     "node-mocks-http": "1.9.0",
     "nodemon": "^2.0.4",