python-numpy: correct LICENSE.txt hash value

python-numpy: correct LICENSE.txt hash value

LICENSE.txt sha256 is wrong. After version bumping from 1.13.3 to 1.15.1
LICENSE.txt sha256 has not be re-calculated.

New LICENSE.txt lists licenses for bundled libraries:
- Numpydoc -> 2-clause BSD
- scipy-sphinx-theme -> 3-clause BSD, PSF and Apache 2.0
- lapack-lite -> 3-clause BSD
- tempita -> BSD derived
- dragon4 -> specific to library, need to refer to dragon4.c file

Update sha256 recalculating it locally.

Fixes:
http://autobuild.buildroot.net/results/08e/08e1121af151c65b2333e06839256eb13f4ad800//
http://autobuild.buildroot.net/results/9d0/9d0e557c5946b76aa4c8c87b7616433c16b61e20//

Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>