Bump third_party/prjxray from `484eae2` to `2c39029`
Bump third_party/prjxray from `484eae2` to `2c39029`

Bumps [third_party/prjxray](https://github.com/SymbiFlow/prjxray) from `484eae2` to `2c39029`.
- [Release notes](https://github.com/SymbiFlow/prjxray/releases)
- [Commits](https://github.com/SymbiFlow/prjxray/compare/484eae2bb7d51bde3a2e46a160bd9a34d4d0891f...2c39029234e20f0d817fda3254fdcf8bf9d2a211)

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