Update Afero to avoid panic on "file name is too long"
Update Afero to avoid panic on "file name is too long"

Fixes #4240

mdhender/hugo,anthonyfok/hugo,mdhender/hugo,mdhender/hugo,fedelibre/hugo,gohugoio/hugo,fedelibre/hugo,gohugoio/hugo,fedelibre/hugo,anthonyfok/hugo,gohugoio/hugo,mdhender/hugo,anthonyfok/hugo,fedelibre/hugo