Update dependency Microsoft.Extensions.Diagnostics.Testing to 10.3.0 (#527)

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

Author: dependencyupdates[bot]

src/NServiceBus.TransactionalSession.Tests/NServiceBus.TransactionalSession.Tests.csproj

@@ -19,7 +19,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Diagnostics.Testing" Version="10.2.0" />
+    <PackageReference Include="Microsoft.Extensions.Diagnostics.Testing" Version="10.3.0" />
   </ItemGroup>
 
   <ItemGroup>