feat(changelog): iam-deprecated-deprecation-of-the-resellercustomerbilli 2025-01-08 (#4185)

Author: ofranc

changelog/january2025/2025-01-08-iam-deprecated-deprecation-of-the-resellercustomerbilli.mdx

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+---
+title: Deprecation of the ResellerCustomerBillingManager permission set
+status: deprecated
+author:
+    fullname: 'Join the #iam channel on Slack.'
+    url: 'https://slack.scaleway.com'
+date: 2025-01-08
+category: security-identity
+product: iam
+---
+
+Since January 8th, 2025, the permission set `ResellerCustomerBillingManager` cannot be used in policies. This permission set was only available for clients that consume Scaleway services through a reseller.
+
+For Organizations that used this permission set, the permission set was renamed from `ResellerCustomerBillingManager` to `BillingManager`. Scripts that used the former name of the permission set, such as Terraform scripts, should be updated to use the new `BillingManager` name. 
+