Potential fix for code scanning alert no. 2: Workflow does not contain permissions (#11)

Signed-off-by: Max Barrett <maximilliangroup@gmail.com>
Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: MaximillianGroup

.github/workflows/phpstan.yml

@@ -1,3 +1,5 @@
+permissions:
+  contents: read
 name: PHPStan
 
 on: