Restore datafusion testing pin (#15318)

alamb · web-flow · commit 97548a258461 · 2025-03-20T08:55:29.000+03:00
diff --git a/datafusion-testing b/datafusion-testing
@@ -0,0 +1 @@
+Subproject commit 3462eaa787459957e38df267a4a21f5bea605807
