Chore: Reduce imports for a slight memory improvement (#9217)

src/documents/parsers.py

@@ -1,4 +1,5 @@
-import datetime
+from __future__ import annotations
+
 import logging
 import mimetypes
 import os
@@ -6,10 +7,10 @@ import re
 import shutil
 import subprocess
 import tempfile
-from collections.abc import Iterator
 from functools import lru_cache
 from pathlib import Path
 from re import Match
+from typing import TYPE_CHECKING
 
 from django.conf import settings
 from django.utils import timezone
@@ -19,6 +20,10 @@ from documents.signals import document_consumer_declaration
 from documents.utils import copy_file_with_basic_stats
 from documents.utils import run_subprocess
 
+if TYPE_CHECKING:
+    import datetime
+    from collections.abc import Iterator
+
 # This regular expression will try to find dates in the document at
 # hand and will match the following formats:
 # - XX.YY.ZZZZ with XX + YY being 1 or 2 and ZZZZ being 2 or 4 digits
@@ -106,7 +111,7 @@ def get_supported_file_extensions() -> set[str]:
     return extensions
 
 
-def get_parser_class_for_mime_type(mime_type: str) -> type["DocumentParser"] | None:
+def get_parser_class_for_mime_type(mime_type: str) -> type[DocumentParser] | None:
     """
     Returns the best parser (by weight) for the given mimetype or
     None if no parser exists