Adding version to deprecation warning

Author: emma58

pyomo/core/plugins/transform/discrete_vars.py

@@ -187,7 +187,8 @@ def _relax_block(self, block, config, reverse_dict):
                     deprecation_warning(
                         "The `transform_deactivated_blocks` arguments is deprecated. "
                         "Either specify deactivated Blocks as targets to activate them "
-                        "if transforming them is the desired behavior."
+                        "if transforming them is the desired behavior.",
+                        version='6.9.3.dev0',
                     )
                 else:
                     continue