Classloader flaw in BackendServiceLoader

[laeubi]

Describe the bug

BackendServiceLoader the BackendProviderService is loaded only with the classname but not with the classloader. This can laed in some restricted environments to a failing classload.

    public Collection<? extends Backend> get() {
        return get(ServiceLoader.load(BackendProviderService.class));
    }

Expected behavior

    public Collection<? extends Backend> get() {
        return get(ServiceLoader.load(BackendProviderService.class, classLoaderSupplier.get()));
    }