Bump normalize-url from 4.5.0 to 4.5.1 in /demo

Bumps [normalize-url](https://github.com/sindresorhus/normalize-url) from 4.5.0 to 4.5.1.
- [Release notes](https://github.com/sindresorhus/normalize-url/releases)
- [Commits](https://github.com/sindresorhus/normalize-url/commits)

---
updated-dependencies:
- dependency-name: normalize-url
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>