Bump Microsoft.Extensions.AI.Abstractions from 10.3.0 to 10.4.0

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.AI.Abstractions
  dependency-version: 10.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -4,7 +4,7 @@
     <System8Version>8.0.22</System8Version>
     <System9Version>9.0.11</System9Version>
     <System10Version>10.0.3</System10Version>
-    <MicrosoftExtensionsVersion>10.3.0</MicrosoftExtensionsVersion>
+    <MicrosoftExtensionsVersion>10.4.0</MicrosoftExtensionsVersion>
   </PropertyGroup>
 
   <!-- Product dependencies shared -->