python3-twisted: Fix CVE-2026-42304

This patch applies the upstream 26.4.0rc2 backport for
CVE-2026-42304. The upstream fix merge is referenced in [1],
and the public CVE advisory is referenced in [2]. The individual
backported commit links are recorded in the patch headers.

[1] https://github.com/twisted/twisted/commit/2d196123264efb0027eecfe1b430be4a9babdbd8
[2] https://github.com/advisories/GHSA-grgv-6hw6-v9g4

Signed-off-by: Hetvi Thakar <hthakar@cisco.com>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>

meta-python/recipes-devtools/python/files/CVE-2026-42304_p2.patch

@@ -0,0 +1,30 @@
+From 094d33d4073368ab1a85fcf63e3b75addb01fd6a Mon Sep 17 00:00:00 2001
+From: Tomas Illuminati Balbin <dev@tomasilluminati.com>
+Date: Mon, 20 Apr 2026 09:17:13 -0300
+Subject: [PATCH] Update src/twisted/names/dns.py
+
+Co-authored-by: Adi Roiban <adiroiban@gmail.com>
+
+CVE: CVE-2026-42304
+Upstream-Status: Backport [https://github.com/twisted/twisted/commit/86e1b5490de5baa8ca284d1e6f4f0ade3e8ad7e0]
+
+(cherry picked from commit 86e1b5490de5baa8ca284d1e6f4f0ade3e8ad7e0)
+Signed-off-by: Hetvi Thakar <hthakar@cisco.com>
+---
+ src/twisted/names/dns.py | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/src/twisted/names/dns.py b/src/twisted/names/dns.py
+index 7142d9e75..93e4080bf 100644
+--- a/src/twisted/names/dns.py
++++ b/src/twisted/names/dns.py
+@@ -2784,8 +2784,7 @@ class Message(tputil.FancyEqMixin):
+         # performed across every name in this message.  It is installed on
+         # the context variable so nested record decoders pick it up without
+         # needing to thread it through each signature.
+-        token = _decodeContextVar.set(_DecodeContext())
+-        try:
++        with _decodeContextVar.set(_DecodeContext()):
+             self.queries = []
+             for i in range(nqueries):
+                 q = Query()