Update OrganizationSecurityPolicy.yaml

[gvijbha]

Fixed https://github.com/hashicorp/terraform-provider-google/issues/14896

Add a deprecation message indicating that the current resource OrganizationSecurityPolicy will be deprecated in favor of FirewallPolicy resource.

Release Note Template for Downstream PRs (will be copied)

compute: deprecated `google_compute_organization_security_policy`. Use `google_compute_firewall_policy` instead.

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