Kubernetes Provider 2.6.3 release notes (#1154)

* Add release notes for Kubernetes Provider v2.6.3

* Update Kubernetes Provider 2.6.3 release date

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

Author: Copilot

releaseNotes/KubernetesProvider.md

@@ -2,6 +2,16 @@
 
 [Image][image] | [Sample][sample]
 
+## 2.6.3 - June 18, 2026
+
+### Enhancements
+
+* Upgraded dependent packages. [#183](https://github.com/Azure/AppConfiguration-KubernetesProvider/pull/183)
+
+### Bug Fixes
+
+* Fixed a bug where key-values loaded from a snapshot reference always took precedence over other selectors, ignoring selector order. Snapshot references now participate in the selector chain, so a later selector can override values resolved from a referenced snapshot. [#180](https://github.com/Azure/AppConfiguration-KubernetesProvider/issues/180)
+
 ## 2.6.0 - March 31, 2026
 
 ### Enhancements