[Dependabot]: Bump neorv32 from 5d45438 to 8ca618c

Bumps [neorv32](https://github.com/stnolting/neorv32) from `5d45438` to `8ca618c`.
- [Release notes](https://github.com/stnolting/neorv32/releases)
- [Commits](stnolting/neorv32@5d45438...8ca618c)

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

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