Bump verilator/master from 4954e76 to 0507fb4 (#700)

Bumps [verilator/master](https://github.com/verilator/verilator) from `4954e76` to `0507fb4`.
- [Commits](verilator/verilator@4954e76...0507fb4)

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

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