postgresql: update license file hash

postgresql: update license file hash

Copyright year update.

Fixes:
http://autobuild.buildroot.net/results/d79/d7989660584430945644e3a4406ba33cee22863d/
http://autobuild.buildroot.net/results/b51/b5141b64ed838caa1daca1bf4fe322dd2afaf0b5/
http://autobuild.buildroot.net/results/a37/a375d533036a1b95af32b6bda086e93174b8c5f0/

Cc: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>