gpu_thrust.cuh: removed thrust::[unary|binary]_function

[otbrown]

...which has been deprecated and removed from CCCL. Fixes compatibility with CUDA 13 #693. Simple fix, base class just deleted.

[otbrown]

@JPRichings could you test with your multifarious GPU access? I will give it a bash on A2 to check this doesn't somehow break the AMD GPU compatibility.

[otbrown]

ARCHER2 AMD tests pass:

QuEST execution environment:
  precision:       2
  multithreaded:   1
  distributed:     1
  GPU-accelerated: 1
  GPU-sharing ok:  0
  cuQuantum:       0
  num nodes:       1

Testing configuration:
  test all deployments:  0
  num qubits in qureg:   6
  max num qubit perms:   25
  max num superop targs: 4
  num mixed-deploy reps: 10

Tested Qureg deployments:
  GPU + OMP + MPI

Randomness seeded to: 315661775
===============================================================================
All tests passed (51869 assertions in 269 test cases)

[JPRichings]

Grace-hopper test passed:

QuEST execution environment:
  precision:       2
  multithreaded:   1
  distributed:     0
  GPU-accelerated: 1
  GPU-sharing ok:  0
  cuQuantum:       0
  num nodes:       1

Testing configuration:
  test all deployments:  0
  num qubits in qureg:   6
  max num qubit perms:   10
  max num superop targs: 4
  num mixed-deploy reps: 10

Tested Qureg deployments:
  GPU + OMP

Randomness seeded to: 1398541465
===============================================================================
All tests passed (31705 assertions in 269 test cases)