fix: parsing pdf error - new_cells as str has no "copy" #12735

Job	Run time
changelog	8s
check-deps (3.9)	2m 37s
check-deps (3.10)	2m 34s
check-deps (3.11)	2m 20s
check-extras (3.9)	24s
check-deps (3.12)	3m 1s
check-extras (3.10)	33s
check-extras (3.11)	25s
check-extras (3.12)	27s
setup (3.9)	7s
setup (3.10)	6s
shfmt	35s
setup (3.11)	8s
shellcheck	8s
setup (3.12)	6s
setup_ingest (3.9)	51s
lint (3.9)	48s
setup_ingest (3.10)	48s
lint (3.10)	58s
lint (3.11)	43s
test_unit (3.9)	22m 50s
test_chipper (3.10)	10m 55s
test_ingest_unit (3.9)	1m 0s
test_unit (3.10)	22m 17s
test_dockerfile	33m 17s
test_ingest_unit (3.10)	42s
test_unit (3.11)	21m 47s
test_unit (3.12)	23m 17s
test_ingest_dest (3.9)	4m 13s
test_ingest_src (3.9)	8m 38s
test_ingest_dest (3.10)	19m 18s
test_unit_no_extras (3.10)	1m 15s
test_ingest_src (3.10)	18m 26s
test_unstructured_api_unit (3.10)	1m 15s
test_unit_dependency_extras (3.10, csv)	1m 55s
test_unit_dependency_extras (3.10, docx)	2m 21s
test_unit_dependency_extras (3.10, odt)	1m 57s
test_unit_dependency_extras (3.10, markdown)	1m 48s
test_unit_dependency_extras (3.10, pypandoc)	1m 46s
test_unit_dependency_extras (3.10, msg)	2m 1s
test_unit_dependency_extras (3.10, pdf-image)	25m 3s
test_unit_dependency_extras (3.10, pptx)	1m 58s
test_unit_dependency_extras (3.10, xlsx)	2m 1s
	4h 7m 47s

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