dev-python/graphviz: add PYTHON3_12 and upstream py3.12 patch for tests

Signed-off-by: Sergey Torokhov <torokhov-s-a@yandex.ru>
Closes: https://github.com/gentoo/gentoo/pull/33502
Signed-off-by: Sam James <sam@gentoo.org>

dev-python/graphviz/files/graphviz-0.20.1_fix_python3_12_test_deprecated_escape.patch

@@ -0,0 +1,30 @@
+From 5ce9fc5de4f2284baa27d7a8d68ab0885d032868 Mon Sep 17 00:00:00 2001
+From: Sebastian Bank <sebastian.bank@uni-leipzig.de>
+Date: Tue, 24 Oct 2023 20:39:52 +0200
+Subject: [PATCH] expect SyntaxWarning in test_deprecated_escape() under Python
+ 3.12
+
+https://docs.python.org/3.12/whatsnew/3.12.html#other-language-changes
+---
+ tests/test_quoting.py | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/tests/test_quoting.py b/tests/test_quoting.py
+index e4ece573bd..3692d38a12 100644
+--- a/tests/test_quoting.py
++++ b/tests/test_quoting.py
+@@ -1,3 +1,4 @@
++import sys
+ import warnings
+ 
+ import pytest
+@@ -14,7 +15,8 @@ def test_deprecated_escape(recwarn, char):
+     escape = eval(rf'"\{char}"')
+ 
+     assert len(recwarn) == 1
+-    w = recwarn.pop(DeprecationWarning)
++    w = recwarn.pop(DeprecationWarning if sys.version_info < (3, 12)
++                    else SyntaxWarning)
+     assert str(w.message).startswith('invalid escape sequence')
+ 
+     assert escape == f'\\{char}'

dev-python/graphviz/graphviz-0.20.1-r1.ebuild

@@ -4,7 +4,7 @@
 EAPI=8
 
 DISTUTILS_USE_PEP517=setuptools
-PYTHON_COMPAT=( python3_{10..11} )
+PYTHON_COMPAT=( python3_{10..12} )
 
 inherit distutils-r1
 
@@ -34,6 +34,10 @@ BDEPEND="
 	)
 "
 
+PATCHES="
+	${FILESDIR}/${P}_fix_python3_12_test_deprecated_escape.patch
+"
+
 distutils_enable_tests pytest
 
 src_prepare() {