Update gradle and dependencies

Signed-off-by: Matthew DeVenny <matt@boxboat.com>

build.gradle

@@ -1,19 +1,18 @@
-apply plugin: 'groovy'
+plugins{
+    id 'groovy'
+}
 
 repositories {
-    jcenter()
+    mavenCentral()
     maven {
         url 'https://repo.jenkins-ci.org/public/'
     }
 }
 
 dependencies {
     // main dependencies
-    implementation group: 'com.cloudbees', name: 'groovy-cps', version: '3785.vee73da_b_9544e'
-    implementation group: 'org.jenkins-ci.main', name: 'jenkins-core', version: '2.414.1'
-    // jenkins-core has a transitive dependency on guava 32.1.1-jre, but that version won't load for gradle
-    // when jenkins-core is upgraded past 2.414.1 this dependency should be re-evaluated and hopefully removed
-    implementation group: 'com.google.guava', name: 'guava', version: '32.1.2-jre'
+    implementation group: 'com.cloudbees', name: 'groovy-cps', version: '3903.v48a_8836749e9'
+    implementation group: 'org.jenkins-ci.main', name: 'jenkins-core', version: '2.452.2'
     implementation group: 'io.jenkins.plugins', name: 'snakeyaml-api', version: '2.2-111.vc6598e30cc65'
     compileOnly group: 'javax.servlet', name: 'javax.servlet-api', version: '4.0.1'
 
@@ -22,7 +21,7 @@ dependencies {
 
     // test dependencies
     testImplementation group: 'junit', name: 'junit', version: '4.13.2'
-    testImplementation group: 'com.lesfurets', name: 'jenkins-pipeline-unit', version: '1.19'
+    testImplementation group: 'com.lesfurets', name: 'jenkins-pipeline-unit', version: '1.20'
 }
 
 task cleanDist(type: Delete) {

gradle-docker.sh

@@ -11,5 +11,5 @@ docker run --rm -i \
     -v "$(pwd):/home/gradle/project" \
     -w "/home/gradle/project" \
     --entrypoint gradle \
-    gradle:8.3.0-jdk17 \
+    gradle:8.9.0-jdk17 \
         "$@"

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists