build(deps): bump third_party/prjxray from `76401bd` to `6fa3a89` (#3212)

Bumps [third_party/prjxray](https://github.com/f4pga/prjxray) from `76401bd` to `6fa3a89`.
- [Release notes](https://github.com/f4pga/prjxray/releases)
- [Commits](https://github.com/f4pga/prjxray/compare/76401bd93e493fd5ff4c2af4751d12105b0f4f6d...6fa3a8925e710256048fc9ccb32766a9d3ba5a99)

---
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 76401bd..6fa3a89 160000
--- a/third_party/prjxray
+++ b/third_party/prjxray
@@ -1 +1 @@
-Subproject commit 76401bd93e493fd5ff4c2af4751d12105b0f4f6d
+Subproject commit 6fa3a8925e710256048fc9ccb32766a9d3ba5a99