build(deps): bump serve-static and @gouvfr/dsfr

Removes [serve-static](https://github.com/expressjs/serve-static). It's no longer used after updating ancestor dependency [@gouvfr/dsfr](https://github.com/GouvernementFR/dsfr). These dependencies need to be updated together.


Removes `serve-static`

Updates `@gouvfr/dsfr` from 1.12.1 to 1.13.0
- [Release notes](https://github.com/GouvernementFR/dsfr/releases)
- [Changelog](https://github.com/GouvernementFR/dsfr/blob/main/CHANGELOG.md)
- [Commits](GouvernementFR/dsfr@v1.12.1...v1.13.0)

---
updated-dependencies:
- dependency-name: serve-static
  dependency-type: indirect
- dependency-name: "@gouvfr/dsfr"
  dependency-type: direct:production
...

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