Bump oracle/oci from 6.12.0 to 6.13.0 in /terraform

Bumps [oracle/oci](https://github.com/oracle/terraform-provider-oci) from 6.12.0 to 6.13.0.
- [Release notes](https://github.com/oracle/terraform-provider-oci/releases)
- [Changelog](https://github.com/oracle/terraform-provider-oci/blob/master/CHANGELOG.md)
- [Commits](oracle/terraform-provider-oci@v6.12.0...v6.13.0)

---
updated-dependencies:
- dependency-name: oracle/oci
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>