chore(deps): update terraform oci to v6.21.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
oci (source)	required_provider	minor	6.20.0 -> 6.21.0

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Release Notes

oracle/terraform-provider-oci (oci)

v6.21.0

Compare Source

Added

• Support for ADB-S: Backup Retention Lock
• Support for StackMonitoring: Metric Extensions : Advanced Support and Integration
• Support for Extend OBP cloud service to include new SKUs for Digital Assets editions
• Support for Data Science: Support Private Endpoint Access for Model Deployment
• Support for Add ZeroETL as a resource in GoldenGate Cloud Service
• Support Llama 3.2 unit shape in Generative AI service
• Support for BDS 3.0.29 Release - Feature Enhancements
• Support for BDS - Kerb to IAM Automation

Bug Fix

• Fix terraform documentation for oci_database_exadb_vm_cluster resource

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