netpbm: update 10.73.08 bottle for Linuxbrew.
netpbm: update 10.73.08 bottle for Linuxbrew.

Closes Linuxbrew/homebrew-core#2217.
Signed-off-by: Jonathan Chang <0bd51b8a224feeddb634965eebae512adcd49a8d@gmail.com>

rwhogg/homebrew-core,rwhogg/homebrew-core,Linuxbrew/homebrew-core,maxim-belkin/homebrew-core,maxim-belkin/homebrew-core,Linuxbrew/homebrew-core,LinuxbrewTestBot/homebrew-core,LinuxbrewTestBot/homebrew-core