unpin `protobuf` #1945

Job	Run time
check_untagged_tests	3s
api_based_int_test (partitioners)	4m 16s
api_based_int_test (chunkers)	6m 48s
embedders_int_test	3m 45s
setup (3.9)	8m 0s
setup (3.10)	7m 39s
nosql_connectors_int_test	7m 33s
sql_connectors_int_test	3m 23s
dest_e2e_test (3.9)	1m 17s
blob_storage_connectors_int_test	1m 24s
dest_e2e_test (3.10)	3m 3s
src_api_test	35s
src_e2e_test (3.9)	1m 26s
uncategorized_connectors_int_test	4m 19s
vector_db_connectors_int_test	5m 56s
src_e2e_test (3.10)	1m 31s
	1h 0m 58s

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