Update dependency NServiceBus.Testing to 10.0.0-alpha.3 (#1225)

Co-authored-by: dependencyupdates[bot] <218638057+dependencyupdates[bot]@users.noreply.github.com>

Author: dependencyupdates[bot]

src/Tests/NServiceBus.Transport.AzureServiceBus.Tests.csproj

@@ -19,7 +19,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="NServiceBus.Testing" Version="10.0.0-alpha.2" />
+    <PackageReference Include="NServiceBus.Testing" Version="10.0.0-alpha.3" />
     <PackageReference Include="Particular.Approvals" Version="2.0.1" />
     <PackageReference Include="PublicApiGenerator" Version="11.4.6" />
   </ItemGroup>