SUSE: 2025:20289-1 moderate: iperf segmentation fault fix

## This update for iperf fixes the following issues: Update to 3.18 (bsc#1234705, CVE-2024-53580): * SECURITY NOTE: Thanks to Leonid Krolle Bi.Zone for discovering a JSON type security vulnerability that caused a segmentation fault in the server. (CVE-2024-53580) This has now been fixed. (PR#1810) * UDP packets per second now reports the correct number of packets, by reporting NET_SOFTERROR if there's a EAGAIN/EINTR errno if no data was sent (#1367/PR#1379). * Several segmentation faults related to threading were fixed. One where `pthread_cancel` was called on an improperly initialized thread (#1801), another where threads were being recycled (#1760/PR#1761), and another where threads were improperly handling signals (#1750/PR#1752). * A segmentation fault from calling `freeaddrinfo` with `NULL` was fixed