default `memmap` parameter to `False` #2947

Job	Run time
stsci / Load tox environments	4s
astropy / Load tox environments	5s
asdf / Load tox environments	6s
third-party / Load tox environments	4s
third-party / weldx (ubuntu-latest)	1m 10s
third-party / sunpy (ubuntu-latest)	2m 50s
third-party / dkist (ubuntu-latest)	2m 45s
third-party / abacusutils (ubuntu-latest)	3m 2s
stsci / astrocut (ubuntu-latest)	57s
stsci / gwcs (ubuntu-latest)	57s
stsci / jwst (ubuntu-latest)	19m 0s
stsci / stdatamodels (ubuntu-latest)	1m 54s
stsci / stpipe (ubuntu-latest)	41s
stsci / roman_datamodels (ubuntu-latest)	1m 40s
astropy / asdf-astropy (ubuntu-latest)	2m 26s
astropy / specutils (ubuntu-latest)	1m 43s
asdf / asdf-wcs-schemas (ubuntu-latest)	1m 50s
asdf / asdf-coordinates-schemas (ubuntu-latest)	3m 17s
asdf / asdf-zarr (ubuntu-latest)	32s
asdf / asdf-compression (ubuntu-latest)	31s
	45m 34s

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