Revert compatibility_minimum change

Since 4.2 is still compatible with 4.1, the minimum compatibility can remain 4.1.

Author: nathantalewis

tutorials/scripting/gdextension/gdextension_cpp_example.rst

@@ -363,7 +363,7 @@ loaded for each platform and the entry function for the module. It is called ``g
     [configuration]
 
     entry_symbol = "example_library_init"
-    compatibility_minimum = "4.2"
+    compatibility_minimum = "4.1"
 
     [libraries]