Restore support in tests for Sphinx<7.2

Author: AA-Turner

tests/conftest.py

@@ -2,9 +2,16 @@
 
 import pytest
 
+import sphinx
+
 pytest_plugins = 'sphinx.testing.fixtures'
 
 
 @pytest.fixture(scope='session')
 def rootdir():
+    if sphinx.version_info[:2] < (7, 2):
+        from sphinx.testing.path import path
+
+        return path(__file__).parent.abspath() / 'roots'
+
     return Path(__file__).resolve().parent / 'roots'