Force installation of PrettyTable 0.7

* Version 1.0 is not working with Patroni 1.6.4

changelogs/unreleased/5701-gitlab-ctl-patroni-members-results-in-error-with-prettytable.yml

+---
+title: Force install PrettyTable 0.7
+merge_request: 4628
+author:
+type: fixed

config/software/patroni.rb

@@ -31,5 +31,9 @@ build do
   patch source: "add-license-file.patch"
+  # Version 1.0 of PrettyTable does not work with Patroni 1.6.4
+  # https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/5701
+  command "#{install_dir}/embedded/bin/pip3 install prettytable==0.7", env: env
+
   command "#{install_dir}/embedded/bin/pip3 install patroni[consul]==#{version}", env: env
 end