Fix ruff import-ordering in covering and spatial tests

ruff check flagged unsorted imports in test/core/test_covering.py
and test/tool/test_spatial.py. Fix by reorganising import blocks.

src/bonsai/test/core/test_covering.py

@@ -18,9 +18,10 @@
 #
 # This file was generated with the assistance of an AI coding tool.
 
+import pytest
+
 import bonsai
 import bonsai.core.covering as subject
-import pytest
 from test.core.bootstrap import Prophecy, ifc, root, spatial
 
 # NOTE: The Prophecy mocking framework serialises call arguments as JSON,

src/bonsai/test/tool/test_spatial.py

@@ -30,7 +30,8 @@ from mathutils import Matrix
 
 import bonsai.core.tool
 import bonsai.tool as tool
-from bonsai.tool.spatial import Spatial as subject, _bump_geom_cache_token
+from bonsai.tool.spatial import Spatial as subject
+from bonsai.tool.spatial import _bump_geom_cache_token
 from test.bim.bootstrap import NewFile