graphics/netpbm: Update to 10.85.03

• Fixes a bug where pstopnm ignores -textalphabits [1]

Changes: https://gitlab.com/tobiask/netpbm/raw/v10.85.03/doc/HISTORY
PR: 236097 [1]
Reported by: Shigeharu TAKENO <shige@iee.niit.ac.jp> [1]
MFH: 2019Q1