nginx-upload: bump version to fix build against nginx-1.12.x

nginx-upload: bump version to fix build against nginx-1.12.x

Fixes:
http://autobuild.buildroot.net/results/9ec/9ecf714667736bf61f643ad55588d3d6ebdde603/
http://autobuild.buildroot.net/results/cea/cea64e30e98543e10c8819f6337babfec6d7ac0f/

Bump to the latest commit on the 2.255 branch, which contains pull request
88 (work with latest nginx versions):

https://github.com/vkholodkov/nginx-upload-module/pull/88

git shortlog aba1e3f34c754551f4f49e572bc86863d535609d..
Anton (1):
      Add files via upload

Valery Kholodkov (5):
      Added tag for version 2.0.8
      Recreated tag for version 2.0.8
      Backported to nginx 0.5.37 by Anthony Kholodkov
      Updated Changelog
      Merge pull request #88 from antonbarinov/2.255

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>