chore: update pull_request_template.md (#2428)

## Description

As we now use `commitlint` on PR titles, there is no need to have the
checklist in the PR description for the type of change.

## Related Issue

Fixes N/A

## Checklist before merging

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

.github/pull_request_template.md

@@ -8,12 +8,6 @@ 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