test_directory: Fix failures after nar extid version bump

Related to swh-loader-core@c9b51f8b.

swh/loader/git/tests/test_directory.py

@@ -198,7 +198,10 @@ def test_git_loader_directory(swh_storage, datadir, tmp_path, reference):
 
     # Ensure the extids got stored as well
     extids = fetch_extids_from_checksums(
-        loader.storage, checksum_layout="nar", checksums=checksums
+        loader.storage,
+        checksum_layout="nar",
+        checksums=checksums,
+        extid_version=loader.extid_version,
     )
     assert len(extids) == len(checksums)
 
@@ -240,7 +243,10 @@ def test_loader_git_directory_hash_mismatch(swh_storage, datadir, tmp_path):
 
     # Ensure no extids got stored
     extids = fetch_extids_from_checksums(
-        loader.storage, checksum_layout="nar", checksums=faulty_checksums
+        loader.storage,
+        checksum_layout="nar",
+        checksums=faulty_checksums,
+        extid_version=loader.extid_version,
     )
     assert len(extids) == 0