Add release notes for Kubernetes Provider v2.6.0 (#1146)

* Add release notes for Kubernetes Provider v2.6.0

Co-authored-by: linglingye001 <143174321+linglingye001@users.noreply.github.com>
Agent-Logs-Url: https://github.com/Azure/AppConfiguration/sessions/3a3214a7-eee7-4e3c-bd31-e8a85d4a2c82

* Add dependency and Go 1.25 upgrade to v2.6.0 release notes

Agent-Logs-Url: https://github.com/Azure/AppConfiguration/sessions/bb1ee44b-d1eb-48a9-a45f-1d9d60665945

Co-authored-by: linglingye001 <143174321+linglingye001@users.noreply.github.com>

* Update v2.6.0 release date to March 31, 2026

Agent-Logs-Url: https://github.com/Azure/AppConfiguration/sessions/f508bd96-2c64-4701-9890-322e5c8acaea

Co-authored-by: linglingye001 <143174321+linglingye001@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: linglingye001 <143174321+linglingye001@users.noreply.github.com>

Author: Copilot

releaseNotes/KubernetesProvider.md

@@ -2,6 +2,15 @@
 
 [Image][image] | [Sample][sample]
 
+## 2.6.0 - March 31, 2026
+
+### Enhancements
+
+* Added support for snapshot references. If a configuration setting's value is a snapshot reference, loading it automatically loads all key-values from the referenced snapshot. This enables dynamically switching between snapshots at runtime. [#166](https://github.com/Azure/AppConfiguration-KubernetesProvider/pull/166)
+* Added support for specifying the Entra ID audience for authentication with Azure App Configuration. [#164](https://github.com/Azure/AppConfiguration-KubernetesProvider/pull/164)
+* Upgraded dependent packages. [#165](https://github.com/Azure/AppConfiguration-KubernetesProvider/pull/165)
+* Upgraded Go version to 1.25. [#165](https://github.com/Azure/AppConfiguration-KubernetesProvider/pull/165)
+
 ## 2.5.3 - Mar 4, 2026
 
 ### Enhancements