Update dependency checkstyle to v10.12.2 (#203)

* Update dependency checkstyle to v10.12.2

* remove conflicting guava dependency

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Michael1142 <michael.johnson9@justice.gov.uk>

build.gradle

@@ -175,12 +175,6 @@ dependencies {
     contractTestImplementation sourceSets.test.runtimeClasspath
 }
 
-dependencyManagement {
-    dependencies {
-        dependency group: 'com.google.guava', name: 'guava', version: '32.1.2-jre'
-    }
-}
-
 // https://jeremylong.github.io/DependencyCheck/dependency-check-gradle/configuration.html
 dependencyCheck {
     // Specifies if the build should be failed if a CVSS score above a specified level is identified.