sip: bump version

remove 3.9

dev-python/sip/patches/sip-6.8.6.patchset

@@ -0,0 +1,30 @@
+From a5b67fff1944aa8180f12f290892920b208a0906 Mon Sep 17 00:00:00 2001
+From: Jerome Duval <jerome.duval@gmail.com>
+Date: Sun, 21 Nov 2021 00:01:45 +0100
+Subject: use get_python_inc
+
+
+diff --git a/sipbuild/project.py b/sipbuild/project.py
+index 60a3e4f..92f910e 100644
+--- a/sipbuild/project.py
++++ b/sipbuild/project.py
+@@ -22,6 +22,7 @@
+ 
+ 
+ import collections
++import distutils.sysconfig
+ import os
+ import packaging
+ import shutil
+@@ -73,7 +74,7 @@ class Project(AbstractProject, Configurable):
+         Option('py_debug', option_type=bool),
+ 
+         # The name of the directory containing Python.h.
+-        Option('py_include_dir', default=sysconfig.get_path('include')),
++        Option('py_include_dir', default=distutils.sysconfig.get_python_inc()),
+ 
+         # The name of the target Python platform.
+         Option('py_platform'),
+-- 
+2.37.3
+