package/iperf3: security bump to version 3.19.1

Release notes:
https://github.com/esnet/iperf/releases/tag/3.19.1

Fixes the following security issues:
- An off-by-one heap overflow has been fixed in authentication.
  CVE-2025-54349, ESNET-SECADV-2025-0003)
  https://github.com/advisories/GHSA-8xx8-qrh3-q8mq

- An assert in authentication has been removed. (CVE-2025-54350,
  ESNET-SECADV-2025-0002)
  https://github.com/advisories/GHSA-r6x8-74x9-5mc9

- A buffer overflow in the --skip-rx-copy option for zerocopy
  has been fixed. (CVE-2025-54351, ESNET-SECADV-2025-0001)
  https://github.com/advisories/GHSA-xjwm-4pfw-49g2

Signed-off-by: Akhilesh Nema <nemaakhilesh@gmail.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit 96febd9c16)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

package/iperf3/iperf3.hash

@@ -1,4 +1,4 @@
-# From https://downloads.es.net/pub/iperf/iperf-3.19.tar.gz.sha256
-sha256  040161da1555ec7411a9d81191049830ef37717d429a94ee6cf0842618e0e29c  iperf-3.19.tar.gz
+# From https://downloads.es.net/pub/iperf/iperf-3.19.1.tar.gz.sha256
+sha256  dc63f89ec581ea99f8b558d8eb35109de06383010db5a1906c208a562ba0c270  iperf-3.19.1.tar.gz
 # Locally computed
 sha256  7c9ba0385fcf35c4c9e08ad0c0cba72d4315f36f0f742fef4de826a28cc33a97  LICENSE

package/iperf3/iperf3.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-IPERF3_VERSION = 3.19
+IPERF3_VERSION = 3.19.1
 IPERF3_SITE = https://downloads.es.net/pub/iperf
 IPERF3_SOURCE = iperf-$(IPERF3_VERSION).tar.gz
 IPERF3_LICENSE = BSD-3-Clause, BSD-2-Clause, MIT