fix: use simple template for pull request

Signed-off-by: mitsudome-r <[email protected]>

Author: mitsudome-r

.github/sync-files.yaml

@@ -5,8 +5,7 @@
     - source: .github/ISSUE_TEMPLATE/config.yml
     - source: .github/ISSUE_TEMPLATE/task.yaml
     - source: .github/dependabot.yaml
-    - source: .github/pull_request_template_complex.md
-      dest: .github/pull_request_template.md
+    - source: .github/pull_request_template.md
     - source: .github/stale.yml
     - source: .github/workflows/cancel-previous-workflows.yaml
     - source: .github/workflows/check-build-depends.yaml