Test multiple Python versions.

Py_REFCNT was stabilized in 3.9, uses this official API instead of the
`ob_refcnt` field that doesn't exist in the free-threaded build of 3.13.

.github/workflows/test-osx.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8.10]
+        python-version: ['3.8.10', '3.12']
         cxx: [clang++]
         std: [c++11, c++14] # TODO: c++17 is failing !
 

src/converter/from_python.cpp

@@ -222,7 +222,13 @@ namespace
       , char const* ref_type)
   {
       handle<> holder(source);
-      if (source->ob_refcnt <= 1)
+      if (
+#if PY_VERSION_HEX < 0x03090000
+                source->ob_refcnt
+#else
+                Py_REFCNT(source)
+#endif
+                <= 1)
       {
           handle<> msg(
 #if PY_VERSION_HEX >= 0x3000000