[BUG] pyobjects renderer fails with Sls require

Description

Using the pyobjects renderer, specifying a require requisite argument on Sls require=Sls("requirement") gives an error

[CRITICAL] Rendering SLS test failed, render error: name 'Sls' is not defined
...
NameError: name 'Sls is not defined

The equivalent to specify a requirement on a full sls in jinja|yaml which works is

include:
  - requirement

"/testfile":
   file.managed:
     - owner: "root"
     - group: "root"
     - require:
       - sls: "requirement"

Setup

• ec2 instance running rhel 7.9

• classic packaging (yum install salt-minion)

• Create /srv/salt/test.sls:

  #!pyobjects
  include("requirement")
  File.managed("/testfile", owner="root", group="root", require=Sls("requirement"))
  

• [] Create /srv/salt/requirement.sls:

  #!pyobjects
  File.managed("/requirement", owner="root", group="root")
  

Steps to Reproduce the behavior

salt-call --local state.apply test

Expected behavior
Expected to create a require requisite on the full sls requirement file.

Versions Report

Salt Version:
        Salt: 3004.1

System Versions:
      dist: rhel 7.9 Maipo
    locale: UTF-8
   release: 3.10.0-1160.15.2.el7.x86_64
   system: Linux

Start by reproducing the failure with salt-call --local state.apply test using /srv/salt/test.sls and /srv/salt/requirement.sls. Trace how the pyobjects renderer resolves the Sls requisite and compare it with the working jinja|yaml form. Done means the pyobjects example creates the requisite without a NameError and existing renderer tests still pass.