(PA-7366) Pass secrets to install nightly gems

Resolves this error:

    The workflow is not valid. .github/workflows/unit_tests.yaml (Line: 16, Col: 11):
    Secret PUPPET_FORGE_TOKEN_PUBLIC is required, but not provided while calling.

Author: joshcooper

.github/workflows/daily_unit_tests_with_nightly_puppet_gem.yaml

@@ -9,6 +9,7 @@ on:
 jobs:
   daily_unit_tests_with_nightly_puppet_gem:
     uses: "puppetlabs/phoenix-github-actions/.github/workflows/unit_tests_with_nightly_puppet_gem.yaml@main"
+    secrets: inherit
 
   notify-via-slack:
     name: Notify workflow conclusion via Slack