Dependency upgrades: nbconvert and cryptography

[bsowell]

Missed a couple of nbconvert instances in the last commit. Also upgrade cryptography due to a CVE that just came in.

[blacksmith-sh]

Found 21 test failures on Blacksmith runners:

Failures

Test	View Logs
test_chained_llm_table_structure_extractor	View Logs
test_openai_table_structure_extractor	View Logs
test_pdf_to_opensearch_with_llm_caching	View Logs
test_sycamore_batched	View Logs
test_take_first_array	View Logs
test_to_neo4j	View Logs
/home/runner/_work/sycamore/sycamore/notebooks/ArynPartitionerPython/ipynb	View Logs
/home/runner/_work/sycamore/sycamore/notebooks/docprep/ minilm-l6-v2_greedy-section-merger_opensearch/ipynb	View Logs
test_aryn_reader_with_original_elements[ExecMode/LOCAL]	View Logs
test_aryn_reader_with_original_elements[ExecMode/RAY]	View Logs
TestOpenSearchRead/test_result_filter_on_property_knn	View Logs
TestPaddleOcr/test_paddle_ocr_on_pdf	View Logs
TestSycamoreQuery/test_dry_run[False]	View Logs
TestSycamoreQuery/test_dry_run[True]	View Logs
TestSycamoreQuery/test_forked[False]	View Logs
TestSycamoreQuery/test_forked[True]	View Logs
TestSycamoreQuery/test_simple[True]	View Logs
TestSycamoreQuery/test_simple_with_result_filter[False]	View Logs
TestSycamoreQuery/test_vector_search_2	View Logs
TestSycamoreQuery/test_vector_search_3	View Logs
TestSycamoreQuery/test_vector_search_with_result_filter[False]	View Logs