[Dependabot]: Bump neorv32 from e854085 to ad8f71b

Bumps [neorv32](https://github.com/stnolting/neorv32) from `e854085` to `ad8f71b`.
- [Release notes](https://github.com/stnolting/neorv32/releases)
- [Commits](stnolting/neorv32@e854085...ad8f71b)

---
updated-dependencies:
- dependency-name: neorv32
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>