chore: prepare changelog for release v3.9.0 (#940)

Author: mawasile

.changes/3.9.0.md

@@ -0,0 +1,11 @@
+## 3.9.0 - 2025-10-01
+
+### 💫 Changed
+
+* [#928](https://github.com/microsoft/terraform-provider-power-platform/issues/928) Enhanced powerplatform_connectors data source to support filtering by environment_id
+* [#910](https://github.com/microsoft/terraform-provider-power-platform/issues/910) Extended powerplatform_environment_settings resource to support new AI-powered features including Copilot Studio settings, PowerApps Maker Bot, AI form fill capabilities, and natural language search features
+
+### 🪲 Fixed
+
+* [#877](https://github.com/microsoft/terraform-provider-power-platform/issues/877) update API permissions for Power Platform Provider documentation
+* [#878](https://github.com/microsoft/terraform-provider-power-platform/issues/878) update power catalog audience setting validation to include SpecificAdmins option and correct string validator option

.changes/unreleased/changed-20250925-071621.yaml

@@ -7,6 +7,18 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html),
 and is generated by [Changie](https://github.com/miniscruff/changie).
 
 
+## 3.9.0 - 2025-10-01
+
+### 💫 Changed
+
+* [#928](https://github.com/microsoft/terraform-provider-power-platform/issues/928) Enhanced powerplatform_connectors data source to support filtering by environment_id
+* [#910](https://github.com/microsoft/terraform-provider-power-platform/issues/910) Extended powerplatform_environment_settings resource to support new AI-powered features including Copilot Studio settings, PowerApps Maker Bot, AI form fill capabilities, and natural language search features
+
+### 🪲 Fixed
+
+* [#877](https://github.com/microsoft/terraform-provider-power-platform/issues/877) update API permissions for Power Platform Provider documentation
+* [#878](https://github.com/microsoft/terraform-provider-power-platform/issues/878) update power catalog audience setting validation to include SpecificAdmins option and correct string validator option
+
 ## 3.8.0 - 2025-07-03
 
 ### ✨ Added