update the log4j-slf4j2-impl library to v2.25.4

Author: stephengold

gradle/libs.versions.toml

@@ -28,7 +28,7 @@ jolt-jni-windows64 = { module = "com.github.stephengold:jolt-jni-Windows64", ver
 jolt-jni-windows64avx2 = { module = "com.github.stephengold:jolt-jni-Windows64_avx2", version.ref = "jolt-jni" }
 
 junit4 = "junit:junit:4.13.2"
-log4j-impl = "org.apache.logging.log4j:log4j-slf4j2-impl:2.25.3"
+log4j-impl = "org.apache.logging.log4j:log4j-slf4j2-impl:2.25.4"
 oshi-core = "com.github.oshi:oshi-core:6.10.0"
 sim-math = "com.simsilica:sim-math:1.6.0"