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

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
oci (source)	required_provider	minor	6.14.0 -> 6.15.0

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Release Notes

oracle/terraform-provider-oci (oci)

v6.15.0

Compare Source

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

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