CVS joy: use all four numbers for the year, there's plenty of space

[Debian Policy CVS]

CVSROOT:        /cvs/debian-policy
Module name:    debian-policy
Changes by:     joy     Tue Jul  8 11:28:07 MDT 2003

Modified files:
        .              : upgrading-checklist.html 

Log message:
  use all four numbers for the year, there's plenty of space