Speed up wrfchem_icbc.fetch

By switching from xarray to netCDF4 for reading 'Times' in the boundary conditions file
3 jobs for wrf in 0 seconds (queued for 77 minutes and 54 seconds)
latest
Name Stage Failure
failed
article Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
article_uncertainties Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log