fix: tools/ci-ts/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-INFLIGHT-6095116
- https://snyk.io/vuln/SNYK-JS-UNSETVALUE-2400660

tools/ci-ts/package.json

@@ -26,7 +26,7 @@
     "ethers": "^4.0.44",
     "execa": "^4.0.2",
     "isomorphic-unfetch": "^3.0.0",
-    "jest": "^25.1.0",
+    "jest": "^27.0.0",
     "link_token": "^1.0.6",
     "ts-jest": "^25.2.1",
     "typescript": "^3.7.5"