build(deps): bump third_party/prjxray from `f7a1705` to `a9dfd0b` (#3501)

Bumps [third_party/prjxray](https://github.com/f4pga/prjxray) from `f7a1705` to `a9dfd0b`.
- [Commits](https://github.com/f4pga/prjxray/compare/f7a17050466c0960eedd20f263175b7038a0f393...a9dfd0b229a795bc7e4ab5b8405f9b1bb3525120)

---
updated-dependencies:
- dependency-name: third_party/prjxray
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/third_party/prjxray b/third_party/prjxray
index f7a1705..a9dfd0b 160000
--- a/third_party/prjxray
+++ b/third_party/prjxray
@@ -1 +1 @@
-Subproject commit f7a17050466c0960eedd20f263175b7038a0f393
+Subproject commit a9dfd0b229a795bc7e4ab5b8405f9b1bb3525120