chore: Bump heex grammar

jcs090218 · github-actions[bot] · commit 21ced6867396 · 2025-06-22T02:22:58.000Z
diff --git a/repos/heex b/repos/heex
@@ -1 +1 @@
-Subproject commit 008626a3fad379d17c81d5ed576edd9bd7a4fbf7
+Subproject commit 6603380caf806b3e6c7f0bf61627bb47023d79f1
