prep for release (Azure#51060)

Author: christothes

sdk/core/System.ClientModel/CHANGELOG.md

@@ -1,14 +1,10 @@
 # Release History
 
-## 1.5.0-beta.2 (Unreleased)
+## 1.5.0 (2025-07-03)
 
 ### Features Added
 
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
+- Added the following types for 3rd-party Authentication support: `AuthenticationTokenProvider`, `GetTokenOptions`, `AuthenticationToken`, `AuthenticationPolicy`, and `BearerTokenPolicy`.
 
 ## 1.5.0-beta.1 (2025-06-13)
 

sdk/core/System.ClientModel/src/System.ClientModel.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <Description>Contains building blocks for clients that call cloud services.</Description>
-    <Version>1.5.0-beta.2</Version>
+    <Version>1.5.0</Version>
     <!--The ApiCompatVersion is managed automatically and should not generally be modified manually.-->
     <ApiCompatVersion>1.4.2</ApiCompatVersion>
     <Nullable>enable</Nullable>