chore(csharp): Bump System.Net.Http.WinHttpHandler from 8.0.2 to 8.0.3

---
updated-dependencies:
- dependency-name: System.Net.Http.WinHttpHandler
  dependency-version: 8.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

csharp/Directory.Packages.props

@@ -45,7 +45,7 @@
     <PackageVersion Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.12.0" />
     <PackageVersion Include="System.Diagnostics.DiagnosticSource" Version="9.0.6" />
     <PackageVersion Include="System.Net.Http" Version="4.3.4" />
-    <PackageVersion Include="System.Net.Http.WinHttpHandler" Version="8.0.2" />
+    <PackageVersion Include="System.Net.Http.WinHttpHandler" Version="8.0.3" />
     <PackageVersion Include="System.Text.Json" Version="9.0.9" />
     <PackageVersion Include="System.Threading.Channels" Version="9.0.8" />
     <PackageVersion Include="xunit" Version="2.9.3" />