v12.8.9

• 12.8.8 was published from the 12.8.7 build, only its fluent_conv dependency
  was new: locize --version printed 12.8.7, the fluent export still failed
  on empty values, and its binaries were the 12.8.7 ones. 12.8.9 is built from
  the same code and contains everything listed under 12.8.8.