fix: FORMS-1302 contributing link correction (bcgov#1393)

.github/pull_request_template.md

@@ -30,7 +30,7 @@ This is a breaking change because ...
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-- [ ] I have read the [CONTRIBUTING](CONTRIBUTING.md) doc
+- [ ] I have read the [CONTRIBUTING](../CONTRIBUTING.md) doc
 - [ ] I have checked that unit tests pass locally with my changes
 - [ ] I have run the npm script lint on the frontend and backend
 - [ ] I have added tests that prove my fix is effective or that my feature works