chore: Bump pgn grammar (#537)

github-actions[bot] · web-flow · commit 3425f6edb3fc · 2024-04-14T12:21:33.000-07:00
diff --git a/repos/pgn b/repos/pgn
@@ -1 +1 @@
-Subproject commit db5c78fdc00093bf2a4080d7c0104239763d6ba9
+Subproject commit b4d224c776d220afd36070f632df84b9e9594810
