Fix potential memory leak in TypedArgument

Summary: Another Claude identified leak. We're using `pytype.release();` instead of `pytype.reset();` and then he also decided to fix up the assignment operator.

Reviewed By: jbower-fb

Differential Revision: D91513285

fbshipit-source-id: 2c45c53f3cd74bf0f3614bd5eac724a833a56704

Author: DinoV

cinderx/Jit/hir/hir.cpp

@@ -1197,7 +1197,7 @@ TypedArgument::TypedArgument(
 
 TypedArgument::~TypedArgument() {
   ThreadedCompileSerialize guard;
-  pytype.release();
+  pytype.reset();
 }
 
 TypedArgument::TypedArgument(const TypedArgument& other)