replace style guide link

Thanks to @Grajales-K ! ⭐

Author: SallyMcGrath

.github/pull_request_template.md

@@ -20,7 +20,7 @@ Self checklist
 - [ ] I have committed my files one by one, on purpose, and for a reason
 - [ ] I have titled my PR with COHORT_NAME | FIRST_NAME LAST_NAME | REPO_NAME | WEEK 
 - [ ] I have tested my changes
-- [ ] My changes follow the [style guide](https://syllabus.codeyourfuture.io/guides/code-style-guide/)
+- [ ] My changes follow the [style guide](https://curriculum.codeyourfuture.io/guides/contributing/)
 - [ ] My changes meet the [requirements](./README.md) of this task
 
 ## Changelist