Change Qt version for a laugh.

Author: Tristan Youngs

.github/workflows/_checkout.yml

@@ -12,7 +12,7 @@ on:
         default: 13.3
       qtVersion:
         type: string
-        default: 6.4.2
+        default: 6.4.3
       hugoVersion:
         type: string
         default: "0.135.0"