🧪 Test: Important file changes detection feature (#18)

## Summary

This PR tests the new important file changes detection feature in
`Get-PSModuleSettings`.

## What's being tested

The workflow chain:
- `MariusTestModule` → `Process-PSModule@test/important-file-changes` →
`Get-PSModuleSettings@feature/important-file-changes`

## Expected behavior

Since this PR only changes `.github/workflows/Process-PSModule.yml`
(which is in the important files list), the build/test stages **should
run**.

Important files that trigger build/test:
- `.github/workflows/Process-PSModule.yml` ✓ (changed in this PR)
- `src/**`
- `examples/**`
- `README.md`

## Verification

Check the workflow run logs for:
1. "Check for Important File Changes" log group
2. `HasImportantChanges: True` in the output
3. Build and test jobs should run

Author: MariusStorhaug

.github/workflows/Process-PSModule.yml

@@ -27,7 +27,7 @@ permissions:
 
 jobs:
   Process-PSModule:
-    uses: PSModule/Process-PSModule/.github/workflows/workflow.yml@7c92b2ff94b965f4eaef272c3f3e0e766cd683f2 # v5.4.0
+    uses: PSModule/Process-PSModule/.github/workflows/workflow.yml@test/important-file-changes
     secrets:
       APIKey: ${{ secrets.APIKey }}