chore: Update Security link in README.MD (#282)

# What ❔

- update Security link in README.MD

## Why ❔

- when you click on Security on README. it takes you to invalid link

## Checklist

<!-- Check your PR fulfills the following items. -->
<!-- For draft PRs check the boxes as you complete them. -->

- [x] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [ ] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [x] Code has been formatted via `zk fmt` and `zk lint`.

README.md

@@ -21,7 +21,7 @@ The following questions will be answered by the following resources:
 
 ## Policies
 
-- [Security policy](.github/SECURITY.md)
+- [Security policy](SECURITY.md)
 - [Contribution policy](CONTRIBUTING.md)
 
 ## License