Bump NServiceBus.Testing from 9.0.0 to 9.0.1 in /src

Bumps [NServiceBus.Testing](https://github.com/Particular/NServiceBus.Testing) from 9.0.0 to 9.0.1.
- [Release notes](https://github.com/Particular/NServiceBus.Testing/releases)
- [Commits](Particular/NServiceBus.Testing@9.0.0...9.0.1)

---
updated-dependencies:
- dependency-name: NServiceBus.Testing
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

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

@@ -19,7 +19,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="NServiceBus.Testing" Version="9.0.0" />
+    <PackageReference Include="NServiceBus.Testing" Version="9.0.1" />
     <PackageReference Include="Particular.Approvals" Version="2.0.0" />
     <PackageReference Include="PublicApiGenerator" Version="11.4.0" />
   </ItemGroup>