Bump tools/yosys from 30cb72a to 99159e7

Bumps [tools/yosys](https://github.com/The-OpenROAD-Project/yosys) from `30cb72a` to `99159e7`.
- [Commits](The-OpenROAD-Project/yosys@30cb72a...99159e7)

---
updated-dependencies:
- dependency-name: tools/yosys
  dependency-version: 99159e76e837fe69c451bbfa325045264b979111
  dependency-type: direct:production
...

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

Author: dependabot[bot]