apacheGH-41475: [Python] Build with Python 3.13 (apache#42034)

### Rationale for this change

The private function `_Py_IsFinalizing` renamed to `Py_IsFinalizing` in Python 3.13.0a1.  Without this change pyarrow will not compile with this version of Python or higher.

### What changes are included in this PR?

add a version-gated `#define` to handle the change.

### Are these changes tested?

Local build succeeds. 

### Are there any user-facing changes?

no

* GitHub Issue: apache#41475

Lead-authored-by: Thomas A Caswell <tcaswell@gmail.com>
Co-authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>

python/pyarrow/src/arrow/python/udf.cc

@@ -28,6 +28,10 @@
 #include "arrow/util/checked_cast.h"
 #include "arrow/util/logging.h"
 
+// Py_IsFinalizing added in Python 3.13.0a4
+#if PY_VERSION_HEX < 0x030D00A4
+#define Py_IsFinalizing() _Py_IsFinalizing()
+#endif
 namespace arrow {
 using compute::ExecSpan;
 using compute::Grouper;
@@ -47,7 +51,7 @@ struct PythonUdfKernelState : public compute::KernelState {
   // function needs to be destroyed at process exit
   // and Python may no longer be initialized.
   ~PythonUdfKernelState() {
-    if (_Py_IsFinalizing()) {
+    if (Py_IsFinalizing()) {
       function->detach();
     }
   }
@@ -64,7 +68,7 @@ struct PythonUdfKernelInit {
   // function needs to be destroyed at process exit
   // and Python may no longer be initialized.
   ~PythonUdfKernelInit() {
-    if (_Py_IsFinalizing()) {
+    if (Py_IsFinalizing()) {
       function->detach();
     }
   }
@@ -132,7 +136,7 @@ struct PythonTableUdfKernelInit {
   // function needs to be destroyed at process exit
   // and Python may no longer be initialized.
   ~PythonTableUdfKernelInit() {
-    if (_Py_IsFinalizing()) {
+    if (Py_IsFinalizing()) {
       function_maker->detach();
     }
   }
@@ -173,7 +177,7 @@ struct PythonUdfScalarAggregatorImpl : public ScalarUdfAggregator {
   };
 
   ~PythonUdfScalarAggregatorImpl() override {
-    if (_Py_IsFinalizing()) {
+    if (Py_IsFinalizing()) {
       function->detach();
     }
   }
@@ -270,7 +274,7 @@ struct PythonUdfHashAggregatorImpl : public HashUdfAggregator {
   };
 
   ~PythonUdfHashAggregatorImpl() override {
-    if (_Py_IsFinalizing()) {
+    if (Py_IsFinalizing()) {
       function->detach();
     }
   }