Update mediator.mdx

Author: aritchie

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

@@ -7,6 +7,10 @@ import RN from '/src/components/ReleaseNote.astro';
 
 ## v4
 
+### 4.9.1
+<RN type="fix" repo="mediator" githubNumber="40">Fix storage service deadlock</RN>
+<RN type="fix">Fix another release semaphore state in storage service indexing</RN>
+
 ### 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>