Update Jackson to 2.15.4 (#2691)

Author: Quinn-With-Two-Ns

build.gradle

@@ -29,7 +29,7 @@ allprojects {
 ext {
     // Platforms
     grpcVersion = '1.58.1' // [1.38.0,) Needed for io.grpc.protobuf.services.HealthStatusManager
-    jacksonVersion = '2.14.2' // [2.9.0,)
+    jacksonVersion = '2.15.4' // [2.9.0,)
     nexusVersion = '0.4.0-alpha'
     // we don't upgrade to 1.10.x because it requires kotlin 1.6. Users may use 1.10.x in their environments though.
     micrometerVersion = project.hasProperty("edgeDepsTest") ? '1.13.6' : '1.9.9' // [1.0.0,)