python3: bump to version 3.9.0

Refreshed patches.

Dropped 'patches-setuptools/004-site-patch.patch'
Does not apply anymore. Setuptools has removed site.py support:
   https://github.com/pypa/setuptools/issues/2165
If this is still needed, we may need to re-think it's implementation.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

lang/python/python3/patches/015-abort-on-failed-modules.patch

@@ -1,6 +1,6 @@
 --- a/setup.py
 +++ b/setup.py
-@@ -441,6 +441,7 @@ class PyBuildExt(build_ext):
+@@ -536,6 +536,7 @@ class PyBuildExt(build_ext):
              print("Failed to build these modules:")
              print_three_column(failed)
              print()