fix: Fixed invalid extension name in test. (#2319)

The Python testing suite defined an extension named `pytest.quantum,`.
The `,` is not allowed as part of an extension name, making the model
import fail.

Author: zrho

hugr-py/tests/conftest.py

@@ -21,7 +21,7 @@
 
     from hugr.ops import ComWire
 
-QUANTUM_EXT = ext.Extension("pytest.quantum,", ext.Version(0, 1, 0))
+QUANTUM_EXT = ext.Extension("pytest.quantum", ext.Version(0, 1, 0))
 QUANTUM_EXT.add_op_def(
     ext.OpDef(
         name="H",