Update Terraform GoogleCloudPlatform/sql-db/google to v15.2.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
GoogleCloudPlatform/sql-db/google (source)	module	minor	15.0.0 -> 15.2.0

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Release Notes

terraform-google-modules/terraform-google-sql-db (GoogleCloudPlatform/sql-db/google)

v15.2.0

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Features

• add time_zone for mssql (#​488) (0938dec)

v15.1.0

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Features

• added support for enable_private_path_for_google_cloud_services field in replica instances. (#​471) (3d0c204)
• include log for each database name in export workflow (#​407) (e638a24)

Bug Fixes

• port iam_users from postgresql module (#​467) (5732125)
• to avoid password reset for existing additional users (#​461) (1fcdcc4)

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