libevent2: update to 2.1.13

This release includes fixes for:
- CVE-2026-63383
- CVE-2026-63384
- CVE-2026-63379
- CVE-2026-63382
- CVE-2026-63385
- CVE-2026-63388
- CVE-2026-63381
- CVE-2026-63387
- GHSA-5rgj-2c58-7jrc

Full changelog:
https://github.com/libevent/libevent/blob/release-2.1.13-stable/ChangeLog

Signed-off-by: Yanase Yuki <dev@zpc.st>
Link: https://github.com/openwrt/openwrt/pull/25773
Signed-off-by: Nick Hainke <vincent@systemli.org>

package/libs/libevent2/Makefile

@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libevent2
-PKG_VERSION:=2.1.12
-PKG_RELEASE:=2
+PKG_VERSION:=2.1.13
+PKG_RELEASE:=1
 
 PKG_SOURCE:=libevent-$(PKG_VERSION)-stable.tar.gz
 PKG_SOURCE_URL:=https://github.com/libevent/libevent/releases/download/release-$(PKG_VERSION)-stable
-PKG_HASH:=92e6de1be9ec176428fd2367677e61ceffc2ee1cb119035037a27d346b0403bb
+PKG_HASH:=f7e9383b8c0baa81b687e5b5eecc01beefaf1b19b64151d95ed61647fe7a315c
 PKG_BUILD_DIR:=$(BUILD_DIR)/libevent-$(PKG_VERSION)-stable
 
 PKG_MAINTAINER:=Jo-Philipp Wich <jo@mein.io>