check_latest_release workflow is broken

[ni-jfitzger]

We recently changed a lot of things to support independent package versioning and releases.
Among the things that we changed were our release tagging scheme and the check_latest_release workflow that we use to validate our PyPI releases.

It's supposed to automatically trigger when the GitHub release is created.
It failed to trigger, this time.

When manually run, it failed with the following output:

TAG="nidcpower-1.5.0"
| ~~~~~~~~~~~~~~~~~~~~~
| The term 'TAG=nidcpower-1.5.0' is not recognized as a name of a cmdlet, function, script file, or executable
| program. Check the spelling of the name, or if a path was included, verify that the path is correct and try
| again.