ptyhon3-attrs doesn't need the RDEPENDS on cryptography

[vermaete]

IMHO, the recipe 'meta-python-recipes-devtools/python/python-attrs.inc' at the master branch doesn't need the RDEPENDS on ${PYTHON_PN}-cryptography.

At least I could not find anything about cryto when doing 'devtool modify python3-attrrs' having meta-python at master.

Without the RDEPENDS at crytpograph, my build was passing and working and 12% smaller.

[vermaete]

solved by a patch on the mailinglist of meta-openembedded.