build(deps): bump third_party/cores/veer-el2 from fd01766 to d0991e6

Bumps [third_party/cores/veer-el2](https://github.com/chipsalliance/Cores-VeeR-EL2) from `fd01766` to `d0991e6`.
- [Commits](chipsalliance/Cores-VeeR-EL2@fd01766...d0991e6)

---
updated-dependencies:
- dependency-name: third_party/cores/veer-el2
  dependency-type: direct:production
...

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