chore: update PR template

Inspired by #859

.github/pull_request_template.md

@@ -1,9 +1,7 @@
-<!-- Please provide a brief summary of your changes in the Title above -->
-
-# Description
-
 Please provide a detailed description of the changes made in this pull request.
 
+<details><summary>Checklists...</summary>
+
 ## Contributors Checklist
 
 - [ ] Added new tests, or not needed, or not feasible
@@ -19,3 +17,4 @@ Please provide a detailed description of the changes made in this pull request.
 - [ ] Checked that the author followed the guidelines in `CONTRIBUTING.md`
 - [ ] Checked the conventional-commit (especially PR title and verb, presence of `BREAKING CHANGE:` in the body)
 - [ ] Ensured that this PR is not a significant change or confirmed that the review/consideration process was appropriate for the change
+</details>