Update pennylane requirement from ~=0.36.0 to ~=0.38.0

[dependabot]

Updates the requirements on pennylane to permit the latest version.

Release notes

Sourced from pennylane's releases.

Release 0.38.0

• A new function called qml.registers has been added that lets you seamlessly create registers of wires. [(#5957)](PennyLaneAI/pennylane#5957) [(#6102)](PennyLaneAI/pennylane#6102)

  Using registers, it is easier to build large algorithms and circuits by applying gates and operations to predefined collections of wires. With qml.registers, you can create registers of wires by providing a dictionary whose keys are register names and whose values are the number of wires in each register.

  >>> wire_reg = qml.registers({"alice": 4, "bob": 3})
  >>> wire_reg
  {'alice': Wires([0, 1, 2, 3]), 'bob': Wires([4, 5, 6])}

  The resulting data structure of qml.registers is a dictionary with the same register names as keys, but the values are qml.wires.Wires instances.

  Nesting registers within other registers can be done by providing a nested dictionary, where the ordering of wire labels is based on the order of appearance and nestedness.

  >>> wire_reg = qml.registers({"alice": {"alice1": 1, "alice2": 2}, "bob": {"bob1": 2, "bob2": 1}})
  >>> wire_reg
  {'alice1': Wires([0]), 'alice2': Wires([1, 2]), 'alice': Wires([0, 1, 2]), 'bob1': Wires([3, 4]), 'bob2': Wires([5]), 'bob': Wires([3, 4, 5])}

  Since the values of the dictionary are Wires instances, their use within quantum circuits is very similar to that of a list of integers.

  dev = qml.device("default.qubit")
  @​qml.qnode(dev)
  def circuit():
  for w in wire_reg["alice"]:
  qml.Hadamard(w)
  for w in wire_reg["bob1"]:
      qml.RX(0.1967, wires=w)
  qml.CNOT(wires=[wire_reg["alice1"][0], wire_reg["bob2"][0]])
  return [qml.expval(qml.Y(w)) for w in wire_reg["bob1"]]
  
  print(qml.draw(circuit)())

  0: ──H────────╭●─┤     
  1: ──H────────│──┤     
  2: ──H────────│──┤     
  3: ──RX(0.20)─│──┤  <Y>

... (truncated)

Commits

• 9ba6205 Final updates before 0.38 release (#6202)
• 4a0c41e quality assurance - wire registers (2) (#6184)
• 3d39e18 Cast initial state into complex dtype for default.qubit + Update `Sum.label...
• f521ada v0.38 changelog (#6143)
• 72dc920 Fix sparse matrix with global phase (#6197)
• 39220ed Update validation checks on quantum arithmetic templates (#6194)
• bb577c4 fix renormalization issue (#6190)
• 60d1c73 Documentation for Quantum Arithmetic (#6179)
• 1487a07 fix assert valid pickling test (#6195)
• 60bb1e6 Quality assurance: misc typos (#6192)
• Additional commits viewable in compare view

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[dependabot]

Superseded by #2502.