Try fix tests

Author: XuehaiPan

include/pybind11/detail/common.h

@@ -359,9 +359,7 @@
 #define PYBIND11_ENSURE_INTERNALS_READY                                                           \
     {                                                                                             \
         pybind11::detail::get_internals_pp_manager().unref();                                     \
-        pybind11::detail::get_local_internals_pp_manager().unref();                               \
         pybind11::detail::get_internals();                                                        \
-        pybind11::detail::get_local_internals();                                                  \
     }
 
 #if !defined(GRAALVM_PYTHON)

tests/test_multiple_interpreters/test_multiple_interpreters.py

@@ -210,11 +210,11 @@ def test_dependent_subinterpreters():
 
 PREAMBLE_CODE = textwrap.dedent(
     """
-    import sys
+    def test():
+        import sys
 
-    sys.path.append('.')
+        sys.path.append('.')
 
-    def test():
         import collections
         import mod_per_interpreter_gil_with_singleton as m