Test `test_request_deduplication_edge_cases[shared]` is flaky

[vdusek]

Test test_request_deduplication_edge_cases[shared] is flaky. An IndexError inside Crawlee's RequestQueue.add_request()) can occur, see https://github.com/apify/apify-sdk-python/actions/runs/21956322870/job/63421260583?pr=784. Skip it for now.