fix lint issues across codebase

tests/test_security.py

@@ -104,6 +104,7 @@ class TestProxyTrustValidation:
         )
         assert response.status_code == 201
         import json
+
         data = json.loads(response.data)
         assert "owner" in data
 
@@ -124,6 +125,7 @@ class TestProxyTrustValidation:
             )
             assert response.status_code == 201
             import json
+
             data = json.loads(response.data)
             # Owner should NOT be set because proxy wasn't trusted
             assert "owner" not in data
@@ -148,6 +150,7 @@ class TestProxyTrustValidation:
             )
             assert response.status_code == 201
             import json
+
             data = json.loads(response.data)
             assert "owner" in data
         finally:
@@ -259,9 +262,7 @@ class TestSizeLimits:
 class TestOwnershipEnforcement:
     """Tests for paste ownership and access control."""
 
-    def test_cannot_delete_others_paste(
-        self, client, sample_text, auth_header, other_auth_header
-    ):
+    def test_cannot_delete_others_paste(self, client, sample_text, auth_header, other_auth_header):
         """Users cannot delete pastes they don't own."""
         create = client.post(
             "/",