f-string problem with python3.11

[martin-rdz]

Seems like one of the f-strings is still maleformed:

Traceback (most recent call last):
  File "", line 28, in <module>
    import ppcpy.interface.picassoProc as picassoProc
  File "../ppcpy/interface/picassoProc.py", line 12, in <module>
    import ppcpy.qc.overlapCor as overlapCor
  File "../ppcpy/qc/overlapCor.py", line 88
    logging.info(f'Using time-varying ovrlap function for channel for channel: {channel.replace('_', ' ')}.')

same in line 106

and in ../ppcpy/retrievals/raman.py", line 101

For newer python versions, this seems not to be a problem, but for python3.11 running on rsd2 it is.