Update jest monorepo to v26

Author: renovate-bot

tools/jest/package.json

@@ -9,8 +9,8 @@
     "fast-deep-equal": "^3.1.1",
     "semver": "^7.1.3",
     "create-jest-runner": "^0.5.3",
-    "jest": "^25.1.0",
-    "babel-jest": "^25.1.0",
+    "jest": "^26.0.0",
+    "babel-jest": "^26.0.0",
     "yaml-jest": "^1.0.5",
     "ts-jest": "^25.2.1",
     "typescript": "^3.8.2",