build(deps): bump third_party/cores/ariane from 86a80f0 to a12d511

Bumps [third_party/cores/ariane](https://github.com/pulp-platform/ariane) from `86a80f0` to `a12d511`.
- [Release notes](https://github.com/pulp-platform/ariane/releases)
- [Commits](openhwgroup/cva6@86a80f0...a12d511)

---
updated-dependencies:
- dependency-name: third_party/cores/ariane
  dependency-type: direct:production
...

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