Bump third_party/prjxray from `4b8f3b0` to `a0c2d37`
Bump third_party/prjxray from `4b8f3b0` to `a0c2d37`

Bumps [third_party/prjxray](https://github.com/SymbiFlow/prjxray) from `4b8f3b0` to `a0c2d37`.
- [Release notes](https://github.com/SymbiFlow/prjxray/releases)
- [Commits](https://github.com/SymbiFlow/prjxray/compare/4b8f3b0eb83305579ad5281c75300f95a0e3917c...a0c2d372941f31ffde566ae0adc73d78cf46853a)

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