Bump third_party/prjxray from `6bc8d8a` to `484eae2`
Bump third_party/prjxray from `6bc8d8a` to `484eae2`

Bumps [third_party/prjxray](https://github.com/SymbiFlow/prjxray) from `6bc8d8a` to `484eae2`.
- [Release notes](https://github.com/SymbiFlow/prjxray/releases)
- [Commits](https://github.com/SymbiFlow/prjxray/compare/6bc8d8ad0284bb22d579e0524ff8e96266f1d60a...484eae2bb7d51bde3a2e46a160bd9a34d4d0891f)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
SymbiFlow/symbiflow-arch-defs,SymbiFlow/symbiflow-arch-defs