chore(deps): Bump leptos from 0.8.19 to 0.8.20 (#7)

Bumps [leptos](https://github.com/leptos-rs/leptos) from 0.8.19 to 0.8.20.
- [Release notes](https://github.com/leptos-rs/leptos/releases)
- [Commits](https://github.com/leptos-rs/leptos/commits)

---
updated-dependencies:
- dependency-name: leptos
  dependency-version: 0.8.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]