package/zsh: security bump to version 5.8

package/zsh: security bump to version 5.8

- Fix CVE-2019-20044: In Zsh before 5.8, attackers able to execute
  commands can regain privileges dropped by the --no-PRIVILEGED option.
  Zsh fails to overwrite the saved uid, so the original privileges can
  be restored by executing MODULE_PATH=/dir/with/module zmodload with a
  module that calls setuid().
- Update indentation of hash file (two spaces)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>