[Dependabot]: Bump neorv32 from a6b0d6e to c6ebc0f

Bumps [neorv32](https://github.com/stnolting/neorv32) from `a6b0d6e` to `c6ebc0f`.
- [Release notes](https://github.com/stnolting/neorv32/releases)
- [Commits](stnolting/neorv32@a6b0d6e...c6ebc0f)

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

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