fixup! Eliminate old-fashioned type annotations in src/azul/plugins/

src/azul/plugins/metadata/hca/indexer/transform.py

@@ -21,6 +21,7 @@
     Iterator,
     Mapping,
     Protocol,
+    Self,
     TypeVar,
     get_args,
 )
@@ -392,14 +393,14 @@ def __init__(self, id: str, title: str, category: SubmitterCategory):
         self.by_id[id] = self
 
     @classmethod
-    def for_id(cls, submitter_id: str) -> 'Submitter | None':
+    def for_id(cls, submitter_id: str) -> Self | None:
         try:
             return cls.by_id[submitter_id]
         except KeyError:
             return None
 
     @classmethod
-    def for_file(cls, file: api.File) -> 'Submitter | None':
+    def for_file(cls, file: api.File) -> Self | None:
         if file.file_source is None:
             if (
                 # The DCP/2 system design specification mistakenly required that