Bump Microsoft.Extensions.AI.Abstractions and System.Text.Json

Bumps Microsoft.Extensions.AI.Abstractions from 10.1.1 to 10.2.0
Bumps System.Text.Json from 10.0.1 to 10.0.2

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.AI.Abstractions
  dependency-version: 10.2.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: System.Text.Json
  dependency-version: 10.0.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

dotnet/src/GitHub.Copilot.SDK.csproj

@@ -22,10 +22,10 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="10.1.1" />
+    <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="10.2.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.0" />
     <PackageReference Include="StreamJsonRpc" Version="2.24.84" PrivateAssets="compile" />
-    <PackageReference Include="System.Text.Json" Version="10.0.1" />
+    <PackageReference Include="System.Text.Json" Version="10.0.2" />
   </ItemGroup>
 
 </Project>