fix: 🐛 remove optional tags

ui/admin/app/components/form/credential/ssh_private_key/index.hbs

@@ -120,7 +120,6 @@
       @type='password'
       @value={{@model.private_key_passphrase}}
       @isInvalid={{@model.errors.private_key_passphrase}}
-      @isOptional={{true}}
       disabled={{form.disabled}}
       autocomplete='new-password'
       {{on 'input' (set-from-event @model 'private_key_passphrase')}}