Fix #5827

Signed-off-by: Rostan Tabet <rtabet@nvidia.com>

Author: rostan-t

include/pybind11/gil.h

@@ -120,7 +120,11 @@ class gil_scoped_acquire {
                 pybind11_fail("scoped_acquire::dec_ref(): internal error!");
             }
 #    endif
+            // Make sure that PyThreadState_Clear is not recursively called by finalizers.
+            // See issue #5827
+            ++tstate->gilstate_counter;
             PyThreadState_Clear(tstate);
+            --tstate->gilstate_counter;
             if (active) {
                 PyThreadState_DeleteCurrent();
             }