fix(dependency): Introducing spring dependency management gradle plugin

Spring boot has moved to gradle based dependency management from v2.3.x. This change has brought issue of conflict resolution failure of the Jackson-bom version and kotlin-bom version with gate service when it consumes the maven-bom generated by kork. The issue details are available in given link.
https://docs.google.com/document/d/1Ck4KeoB1ER0aQUTnf3e-x-M3i2Ur0It7YaaxEMiMXls/edit

To resolve this issue while upgrading gate service with spring v2.3.x, we must require the spring dependency management gradle plugin.

build.gradle

@@ -3,10 +3,12 @@ plugins {
   id "org.jetbrains.kotlin.jvm" version "$kotlinVersion" apply false
   id "org.jetbrains.kotlin.plugin.allopen" version "$kotlinVersion" apply false
   id "org.jetbrains.dokka" version "0.10.1" apply false
+  id "io.spring.dependency-management" version "$springDependencyPluginVersion"
 }
 
 allprojects {
   apply plugin: 'io.spinnaker.project'
+  apply plugin: "io.spring.dependency-management"
 
   group = "io.spinnaker.gate"
 
@@ -46,6 +48,12 @@ allprojects {
       testRuntimeOnly "org.objenesis:objenesis"
     }
 
+    dependencyManagement {
+      imports {
+        mavenBom "io.spinnaker.kork:kork-bom:$korkVersion"
+      }
+    }
+
     configurations.all {
       exclude group: 'javax.servlet', module: 'servlet-api'
       exclude group: 'javax.servlet', module: 'javax.servlet-api'

gradle.properties

@@ -5,6 +5,7 @@ korkVersion=7.131.0
 kotlinVersion=1.4.0
 org.gradle.parallel=true
 spinnakerGradleVersion=8.16.0
+springDependencyPluginVersion=1.0.11.RELEASE
 targetJava11=true
 
 # To enable a composite reference to a project, set the