fix(deps): update log4j2 monorepo to v2.26.1

Author: renovate[bot]

build.gradle.kts

@@ -8,7 +8,7 @@ plugins {
 group = "net.azisaba.simpleproxy"
 version = "2.1.1"
 
-extra.set("log4jVersion", "2.25.4")
+extra.set("log4jVersion", "2.26.1")
 
 java {
     toolchain.languageVersion.set(JavaLanguageVersion.of(11))