v1.173.0

What's Changed

• #4648 - Implement new "Federal government" step in legacy request form - [aa] by @abe-alam-ecs in #4851
• #4651: Change 'something wrong' to 'need assistance?' across all emails by @h-m-f-t in #4873
• #4676: Remove "Thank you" and revise footer across all emails by @h-m-f-t in #4872
• #4839 - Remove AP sandbox (to be replaced by SM) by @CocoByte in #4882
• #4839 - Create SM sandbox by @CocoByte in #4883
• #4638 Assign custom nameservers by zone by @erinysong in #4859
• #4839 - Add Samir to fixtures by @CocoByte in #4881

Full Changelog: v1.172.0...v1.173.0