sdba map_blocks fails with non-dask inputs when sdba_encode_cf option is activated

[aulemahal]

Generic Issue

• xclim version: 0.48.2
• Python version: all
• Operating System: all

Description

See Ouranosinc/xscen#362

We cycle of the coords dict and modify it during the loop, which fails.

xclim/xclim/sdba/base.py

Lines 676 to 678 in 4546f28

	for name, crd in ds.coords.items():
	if xr.core.common._contains_cftime_datetimes(crd.variable): # noqa
	ds[name] = xr.conventions.encode_cf_variable(crd.variable)

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