fix: packages/@vuepress/test-utils/package.json to reduce vulnerabili…

…ties

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BRACES-6838727
- https://snyk.io/vuln/SNYK-JS-REQUEST-3361831
- https://snyk.io/vuln/SNYK-JS-TOUGHCOOKIE-5672873
- https://snyk.io/vuln/SNYK-JS-INFLIGHT-6095116
- https://snyk.io/vuln/SNYK-JS-MICROMATCH-6838728
- https://snyk.io/vuln/SNYK-JS-UNSETVALUE-2400660

packages/@vuepress/test-utils/package.json

@@ -27,9 +27,9 @@
     "@vue/test-utils": "^1.0.0-beta.29",
     "@vuepress/core": "1.8.2",
     "@vuepress/shared-utils": "1.8.2",
-    "babel-jest": "^24.7.1",
+    "babel-jest": "^27.0.0",
     "execa": "^1.0.0",
-    "jest": "^24.7.1",
+    "jest": "^29.0.0",
     "jest-serializer-vue": "^2.0.2",
     "ts-jest": "^24.0.2",
     "vue": "^2.6.10",