default `memmap` parameter to `False` #2953

Job	Run time
astropy / Load tox environments	4s
asdf / Load tox environments	5s
third-party / Load tox environments	4s
stsci / Load tox environments	7s
astropy / asdf-astropy (ubuntu-latest)	2m 22s
astropy / specutils (ubuntu-latest)	1m 49s
third-party / weldx (ubuntu-latest)	1m 5s
third-party / sunpy (ubuntu-latest)	2m 57s
third-party / dkist (ubuntu-latest)	2m 42s
third-party / abacusutils (ubuntu-latest)	2m 49s
asdf / asdf-wcs-schemas (ubuntu-latest)	1m 53s
asdf / asdf-coordinates-schemas (ubuntu-latest)	3m 27s
asdf / asdf-zarr (ubuntu-latest)	37s
asdf / asdf-compression (ubuntu-latest)	28s
stsci / astrocut (ubuntu-latest)	58s
stsci / gwcs (ubuntu-latest)	1m 11s
stsci / jwst (ubuntu-latest)	19m 8s
stsci / stdatamodels (ubuntu-latest)	2m 23s
stsci / stpipe (ubuntu-latest)	41s
stsci / roman_datamodels (ubuntu-latest)	1m 38s
	46m 28s

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