Add test and release note

- This commit adds a release note and a test.
- Tests were done with qiskit version 1.1

releasenotes/notes/qpy-serialization-f08c241209706da2.yaml

@@ -0,0 +1,10 @@
+---
+features_qpy:
+  - |
+    qiskit.qpy now saves and loads circuits reliably using
+    `qiskit.qpy.dump` and `qiskit.qpy.load`. Previously, an
+    error was thrown requiring a positional argument `theta` that is
+    now computed generated in the gate method.
+upgrade_qpy:
+  - |
+    Works in 1.x and may need a backport for 0.4x.

test/python/qpy/test_io_from_qpy.py

@@ -0,0 +1,31 @@
+# This code is part of Qiskit.
+#
+# (C) Copyright IBM 2022, 2024.
+#
+# This code is licensed under the Apache License, Version 2.0. You may
+# obtain a copy of this license in the LICENSE.txt file in the root directory
+# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
+#
+# Any modifications or derivative works of this code must retain this
+# copyright notice, and modified files need to carry a notice indicating
+# that they have been altered from the originals.
+
+"""Test cases for qpy loading and saving."""
+
+import io
+
+from qiskit import QuantumCircuit
+from qiskit.qpy import dump, load
+
+
+def test_io():
+    circuit = QuantumCircuit(2)
+    circuit.ms(1.23, [0, 1])
+
+    buf = io.BytesIO()
+    dump(circuit, buf)
+
+    try:
+        _ = load(io.BytesIO(buf.getvalue()))
+    except Exception as e:
+        raise IOError("Loading to and from qpy failed.") from e