Exception TypeError being raised in rules_mapper_bibs

[jermnelson]

When the BibsTransformer's HridHandling is set to preserve001, the check for set membership on line

folio_migration_tools/src/folio_migration_tools/marc_rules_transformation/rules_mapper_bibs.py

Line 481 in 4c59825

if value in self.unique_001s:

raises TypeError: typing.Set[str] is not a generic class

The problem is at line

folio_migration_tools/src/folio_migration_tools/marc_rules_transformation/rules_mapper_bibs.py

Line 55 in 4c59825

self.unique_001s = Set[str]

This is assigning the type hint Set[str] to self.unique_001s and not a set.