build(deps): bump third_party/prjxray from `728c748` to `72e6371` (#3440)

Bumps [third_party/prjxray](https://github.com/f4pga/prjxray) from `728c748` to `72e6371`.
- [Commits](https://github.com/f4pga/prjxray/compare/728c748e2679104922ed24cf7224bacfb8d4fea4...72e6371bbba0692e727b86eb9393dd4b1154e1e9)

---
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 728c748..72e6371 160000
--- a/third_party/prjxray
+++ b/third_party/prjxray
@@ -1 +1 @@
-Subproject commit 728c748e2679104922ed24cf7224bacfb8d4fea4
+Subproject commit 72e6371bbba0692e727b86eb9393dd4b1154e1e9