[BUG] 3000.0 pkg.latest state does not work on macOS

Description
Using pkg.latest state fails to upgrade packages using brew.

Setup
install_git.sls:

Install or upgrade git:
  pkg.latest:
    - name: git

OS: macOS 10.13.6
salt-master/minion: 3000 (installed via brew, run via launchd plist)
git: 2.24.0 (installed previously via brew)

Steps to Reproduce the behavior
Run sudo salt '<target machine>' state.apply install_git.

mini2:
----------
          ID: Install git
    Function: pkg.latest
        Name: git
      Result: False
     Comment: An error was encountered while installing package(s): Brew command failed. Additional info follows:

              result:
                  ----------
                  pid:
                      57932
                  retcode:
                      1
                  stderr:
                      Updating Homebrew...
                      Error: git 2.24.0 is already installed
                      To upgrade to 2.26.1, run `brew upgrade git`.
                  stdout:
     Started: 17:11:32.986756
    Duration: 15156.012 ms
     Changes:

Summary for mini2
------------
Succeeded: 0
Failed:    1
------------
Total states run:     1
Total run time:  15.156 s

Expected behavior
The package should be upgraded properly using brew upgrade.

Versions Report

Salt Version:
           Salt: 3000

Dependency Versions:
           cffi: 1.13.2
       cherrypy: Not Installed
       dateutil: Not Installed
      docker-py: Not Installed
          gitdb: Not Installed
      gitpython: Not Installed
         Jinja2: 2.10.3
        libgit2: 0.99.0
       M2Crypto: 0.35.2
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.6.2
   mysql-python: Not Installed
      pycparser: 2.19
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: 1.1.1
         Python: 3.7.7 (default, Mar 10 2020, 15:43:27)
   python-gnupg: Not Installed
         PyYAML: 3.13
          PyZMQ: 18.1.1
          smmap: Not Installed
        timelib: Not Installed
        Tornado: 4.5.3
            ZMQ: 4.3.2

System Versions:
           dist:
         locale: UTF-8
        machine: x86_64
        release: 17.7.0
         system: Darwin
        version: 10.13.6 x86_64

Additional context
I think this issue is related: #56609