Chore: switch from os.path to pathlib.Path (#9060)

src/documents/migrations/0014_document_checksum.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.9.4 on 2016-03-28 19:09
 
 import hashlib
-import os
+from pathlib import Path
 
 import django.utils.timezone
 import gnupg
@@ -58,16 +58,16 @@ class Document:
 
     @property
     def source_path(self):
-        return os.path.join(
-            settings.MEDIA_ROOT,
-            "documents",
-            "originals",
-            f"{self.pk:07}.{self.file_type}.gpg",
-        )
+        return (
+            Path(settings.MEDIA_ROOT)
+            / "documents"
+            / "originals"
+            / f"{self.pk:07}.{self.file_type}.gpg"
+        ).as_posix()
 
     @property
     def source_file(self):
-        return open(self.source_path, "rb")
+        return Path(self.source_path).open("rb")
 
     @property
     def file_name(self):