chore(deps): update terraform oci to v6.15.0 (#20)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [oci](https://registry.terraform.io/providers/oracle/oci)
([source](https://redirect.github.com/oracle/terraform-provider-oci)) |
required_provider | minor | `6.14.0` -> `6.15.0` |

---

### Release Notes

<details>
<summary>oracle/terraform-provider-oci (oci)</summary>

###
[`v6.15.0`](https://redirect.github.com/oracle/terraform-provider-oci/blob/HEAD/CHANGELOG.md#6150-October-23-2024)

[Compare
Source](https://redirect.github.com/oracle/terraform-provider-oci/compare/v6.14.0...v6.15.0)

##### Added

-   Support for FSS Resource Locking
- Support for ADB-S: Customer Managed Keys via Azure Key Vault and AWS
KMS
-   Compute support for ZPR
-   nlb-cp zpr support
- Support for Add DB 23ai support to Globally Distributed Autonomous
Database
-   Support for OCI Data Science Model Store Backup and Retention
-   Support for FC Redundancy Project

##### Bug Fix

- For the ACD Version selection using env variable and vmNetwork should
not consider state for calculating hash
-   Fixed the timestamp issue to corrected form

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/anza-labs/infra).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC4xMjAuMSIsInVwZGF0ZWRJblZlciI6IjM4LjEyMC4xIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJhcmVhL2RlcGVuZGVuY3kiXX0=-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

terraform/oci/versions.tf

@@ -6,7 +6,7 @@ terraform {
   required_providers {
     oci = {
       source  = "oracle/oci"
-      version = "6.14.0"
+      version = "6.15.0"
     }
   }
 }