Bump System.Net.Http from 4.3.0 to 4.3.4

---
updated-dependencies:
- dependency-name: System.Net.Http
  dependency-version: 4.3.4
  dependency-type: direct:production
...

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

Author: dependabot[bot]

test/DurableTask.AzureStorage.Tests/DurableTask.AzureStorage.Tests.csproj

@@ -52,6 +52,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="System.Net.Http" />
     <None Update="large.jpeg">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>