chore: add pull request permissions to commitlint (#156)

## Description

Add pull request permissions for commitlint.

## Related Issue

Fixes #
<!-- or -->
Relates to #

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [ ] Test, docs, adr added or updated as needed
- [ ] [Contributor Guide
Steps](https://github.com/defenseunicorns/uds-package-mattermost/blob/main/CONTRIBUTING.md#developer-workflow)
followed

.github/workflows/commitlint.yaml

@@ -11,6 +11,7 @@ on:
 # Permissions for the GITHUB_TOKEN used by the workflow.
 permissions:
   contents: read # Allows reading the content of the repository.
+  pull-requests: read # Allows reading pull requests
 
 jobs:
   validate: