chore: Add new option in issue checklist and modify requirements (#3715)

.github/ISSUE_TEMPLATE/issue_template.yml

@@ -15,6 +15,8 @@ body:
           required: true
         - label: I have searched through the existing issues
           required: true
+        - label: For bug reports, I have checked if the bug is reproducible in the latest version of fzf
+          required: false
 
   - type: input
     attributes: