Fix Trait documenter tests for Sphinx >= 7.2 (#1755)

This PR fixes the Trait documenter test for Sphinx >= 7.2. For that
version of Sphinx, the `srcdir` argument to `SphinxTestApp` needs to be
a `pathlib.Path` object rather than a `sphinx.testing.path.path` object.

Closes #1754

traits/util/tests/test_trait_documenter.py

@@ -27,7 +27,6 @@
 if sphinx is not None:
     from sphinx.ext.autodoc import ClassDocumenter, INSTANCEATTR, Options
     from sphinx.ext.autodoc.directive import DocumenterBridge
-    from sphinx.testing.path import path
     from sphinx.testing.util import SphinxTestApp
     from sphinx.util.docutils import LoggingReporter
 
@@ -37,6 +36,11 @@
         TraitDocumenter,
     )
 
+    if sphinx.version_info < (7, 2):
+        from sphinx.testing.path import path as Path
+    else:
+        from pathlib import Path
+
 
 # Configuration file content for testing.
 CONF_PY = """\
@@ -223,7 +227,7 @@ def create_directive(self):
             with open(conf_file, "w", encoding="utf-8") as f:
                 f.write(CONF_PY)
 
-            app = SphinxTestApp(srcdir=path(tmpdir))
+            app = SphinxTestApp(srcdir=Path(tmpdir))
             app.builder.env.app = app
             app.builder.env.temp_data["docname"] = "dummy"