fix: packages/@vuepress/shared-utils/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BRACES-6838727
- https://snyk.io/vuln/SNYK-JS-MICROMATCH-6838728

Author: snyk-bot

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

@@ -34,7 +34,7 @@
     "diacritics": "^1.3.0",
     "escape-html": "^1.0.3",
     "fs-extra": "^7.0.1",
-    "globby": "^9.2.0",
+    "globby": "^14.1.0",
     "gray-matter": "^4.0.1",
     "hash-sum": "^1.0.2",
     "semver": "^6.0.0",