Update release notes for extensions and mediator

Added release note for extensions v1.2.2 fixing boolean binding on stores. Updated mediator v4.9.0 release date to July 26, 2025.

Author: aritchie

src/content/docs/release-notes/extensions.mdx

@@ -16,6 +16,9 @@ import RN from '/src/components/ReleaseNote.astro';
 
 ## Extensions
 
+### 1.2.2 - July 26, 2025
+<RN type="fix">Booleans with false were not binding properly on stores</RN>
+
 ### 1.2 - July 14, 2025
 <RN type="enhancement">ServiceAttribute now has a TryAdd property that will call the appropriate service lifetime method</RN>
 <RN type="enhancement">Additional SingletonAttribute, ScopedAttribute, and TransientAttribute to remove the need for multiple namespaces</RN>

src/content/docs/release-notes/mediator.mdx

@@ -7,7 +7,7 @@ import RN from '/src/components/ReleaseNote.astro';
 
 ## v4
 
-### 4.9.0 - TBD
+### 4.9.0 - July 26, 2025
 <RN type="feature">Blazor now has a connectivity event broadcaster.  Simply add `<InternetConnectivity />` to your main layout (don't add more than 1)</RN>
 <RN type="enhancement">`IContractKeyProvider` provides a new injectable and external way of providing contract keys allowing you to pull values from configuration, source generation, etc without using reflection.  Our current provider works on reflection to maintain backwards compat, but we have a lot of things planned here</RN>
 <RN type="enhancement">Blazor now has a `IConnectivityEventHandler` that you can implement to receive connectivity events</RN>