OPENSUSE-SU-2026:21359-1 Security update for gimp

This update for gimp fixes the following issues: Changes in gimp: - CVE-2026-58379: Fix PSP File Parsing Heap Buffer Overflow bsc1270299 - CVE-2026-58380: Fix buffer overflow in pnmscannergettoken bsc1270444 - CVE-2026-58381: Prevent double-freeing PSP layer name bsc1270239...