Update pennylane requirement from ~=0.36.0 to ~=0.38.0

Updates the requirements on [pennylane](https://github.com/PennyLaneAI/pennylane) to permit the latest version.
- [Release notes](https://github.com/PennyLaneAI/pennylane/releases)
- [Commits](PennyLaneAI/pennylane@v0.36.0...v0.38.0)

---
updated-dependencies:
- dependency-name: pennylane
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements/requirements-pennylane.txt

@@ -1,2 +1,2 @@
 pennylane-qiskit~=0.36.0
-pennylane~=0.36.0
+pennylane~=0.38.0