chore(deps): update dotnet monorepo to v9 (#1201)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

test/AwsSignatureVersion4.Test.csproj

@@ -16,9 +16,9 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.1" />
-    <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.1" />
-    <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="8.0.11" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Http" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="9.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="Shouldly" Version="4.2.1" />
     <PackageReference Include="xunit" Version="2.9.2" />