ci: drop pin-to-main TODO in shared workflow caller

psake/.github#7 is merged; staying on @main intentionally for this
internal CI workflow.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: tablackburn

.github/workflows/test.yml

@@ -16,7 +16,4 @@ jobs:
   # module import on 5.1 are caught by the standard test run rather than a separate smoke test.
   ci:
     name: CI
-    # TODO: the Windows PowerShell 5.1 (test_powershell) job is added upstream in psake/.github#7.
-    # Once that merges, consider pinning to a tagged release or commit SHA of psake/.github
-    # instead of @main.
     uses: psake/.github/.github/workflows/ModuleCI.yml@main