Update path-to-regexp and express to patch security vulnerability

[shermanhuman]

Description

npm audit fix for docusaurus:

✨ soulglow ~\github\continue\docs\docs  git:(main)
❯ npm audit
# npm audit report

path-to-regexp  <0.1.12
Severity: moderate
Unpatched `path-to-regexp` ReDoS in 0.1.x - https://github.com/advisories/GHSA-rhx6-c78j-4q9w
fix available via `npm audit fix`
node_modules/express/node_modules/path-to-regexp
  express  4.0.0-rc1 - 4.21.1 || 5.0.0-alpha.1 - 5.0.0-beta.3
  Depends on vulnerable versions of path-to-regexp
  node_modules/express

2 moderate severity vulnerabilities

To address all issues, run:
  npm audit fix
✨ soulglow ~\github\continue\docs\docs  git:(main)
❯ npm audit fix

changed 2 packages, and audited 1225 packages in 1s

298 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities

Testing

I ran a quick test of navigation, dark/light themes, looked for images/animations failing. All looks good to me locally.

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