Bump verilator/master from 549dd31 to 8cc7e18 (#652)

Bumps [verilator/master](https://github.com/verilator/verilator) from `549dd31` to `8cc7e18`.
- [Commits](verilator/verilator@549dd31...8cc7e18)

---
updated-dependencies:
- dependency-name: verilator/master
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]