build(deps): bump third_party/prjxray-db from `692e9b3` to `515115a`
build(deps): bump third_party/prjxray-db from `692e9b3` to `515115a`

Bumps [third_party/prjxray-db](https://github.com/SymbiFlow/prjxray-db) from `692e9b3` to `515115a`.
- [Release notes](https://github.com/SymbiFlow/prjxray-db/releases)
- [Commits](https://github.com/SymbiFlow/prjxray-db/compare/692e9b3d9717710110204798cb18dc8fcb243fe4...515115abf8b9b088f33bbc7e9428ebb819cce81e)
SymbiFlow/symbiflow-arch-defs,SymbiFlow/symbiflow-arch-defs