[python] Removing numpy from the python requirements
[python] Removing numpy from the python requirements

Removing numpy from python-requirements.txt as it is not currently
used.

Signed-off-by: Vladimir Rozic <832b313c5899de2d6dfc6d8ca4088ea9488a1be3@lowrisc.org>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan