build(deps): bump third_party/prjxray from `731fbce` to `f2d2157`

Bumps [third_party/prjxray](https://github.com/f4pga/prjxray) from `731fbce` to `f2d2157`.
- [Commits](https://github.com/f4pga/prjxray/compare/731fbcecd2878656af14465801c80e2a34057876...f2d21573c7f6bdfa98e86fae5a2f5ef52e23b51c)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/third_party/prjxray b/third_party/prjxray
index 731fbce..f2d2157 160000
--- a/third_party/prjxray
+++ b/third_party/prjxray
@@ -1 +1 @@
-Subproject commit 731fbcecd2878656af14465801c80e2a34057876
+Subproject commit f2d21573c7f6bdfa98e86fae5a2f5ef52e23b51c