Bump third_party/prjxray-db from `ef74779` to `c305988`
Bump third_party/prjxray-db from `ef74779` to `c305988`

Bumps [third_party/prjxray-db](https://github.com/SymbiFlow/prjxray-db) from `ef74779` to `c305988`.
- [Release notes](https://github.com/SymbiFlow/prjxray-db/releases)
- [Commits](https://github.com/SymbiFlow/prjxray-db/compare/ef7477983980a8f764426cfded9676dc39beea5e...c30598857ace7cdcad2c50737aa108c143adf49d)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
SymbiFlow/symbiflow-xc-fasm2bels