Add support Cloud SQL for MySQL 8.4

[shmokmt]

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Description

Cloud SQL for MySQL 8.4 is now generally available.
https://cloud.google.com/sql/docs/mysql/release-notes#October_01_2024

New or Affected Resource(s)

• resource google_sql_database_instance

Potential Terraform Configuration

resource "google_sql_database_instance" {
...
database_version = "MYSQL_8_4"
...
}

References

• https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/sql_database_instance
• https://cloud.google.com/sql/docs/mysql/release-notes

b/383121405