[BUG] TemperatureFromXDMF class not working in transient h transport

[jhdark]

Describe the bug
When using the F.TemperatureFromXDMF in transient h transport cases the following error is produced:

Time stepping...
Traceback (most recent call last):
  File "test.py", line 51, in <module>
    my_model.run()
  File "/home/fenics/shared/FESTIM/FESTIM/generic_simulation.py", line 279, in run
    self.run_transient()
  File "/home/fenics/shared/FESTIM/FESTIM/generic_simulation.py", line 298, in run_transient
    self.iterate()
  File "/home/fenics/shared/FESTIM/FESTIM/generic_simulation.py", line 324, in iterate
    self.T.update(self.t)
  File "/home/fenics/shared/FESTIM/FESTIM/temperature/temperature.py", line 52, in update
    self.expression.t = t
AttributeError: 'NoneType' object has no attribute 't'

To Reproduce

import FESTIM as F
import fenics as f
import numpy as np

# create temperature field xdmf
my_model = F.Simulation(log_level=20)
my_model.mesh = F.MeshFromVertices(vertices=np.linspace(0, 1, num=100))
my_model.materials = F.Materials(
    [
        F.Material(
            id=1,
            D_0=1,
            E_D=1,
        ),
    ]
)
my_model.T = F.Temperature(value=300)
my_model.settings = F.Settings(
    transient=False,
    absolute_tolerance=1e12,
    relative_tolerance=1e-08,
)
my_model.initialise()
T = my_model.T.T
f.XDMFFile("temperature.xdmf").write_checkpoint(
    T, "T", 0, f.XDMFFile.Encoding.HDF5, append=False
)

# run transient simulation with TemperatureFromXDMF class

my_model.T = F.TemperatureFromXDMF(filename="temperature.xdmf", label="T")
my_model.dt = F.Stepsize(initial_value=1)
my_model.settings = F.Settings(
    transient=True,
    final_time=10,
    absolute_tolerance=1e12,
    relative_tolerance=1e-08,
)
my_model.initialise()
my_model.run()

this could potentially be fixed by adding an update function to the class:

def update(self, t):
        pass

[RemDelaporteMathurin]

This is fixed in 0.10.1