Updates Gradle to 8.7 and fix deprecation warning on the build script (#90)

Updates Gradle to 8.7 and fix deprecation warning on the build script.
It updates also Shadow to the latest and restructure the sections because plugins must be after buildscript.
Make explicit the dependency of compileTestJava by patchYaml task.

Author: andsel

build.gradle

@@ -24,29 +24,37 @@ import static java.nio.file.StandardCopyOption.REPLACE_EXISTING
  * specific language governing permissions and limitations
  * under the License.
  */
-apply plugin: "java"
-apply plugin: 'maven-publish'
-apply plugin: "distribution"
-apply plugin: "idea"
-
-group "org.logstash.filters"
-version Files.readAllLines(Paths.get("version")).first()
-
-sourceCompatibility = JavaVersion.VERSION_1_8
-
-buildscript {
+ buildscript {
   repositories {
     mavenCentral()
     gradlePluginPortal()
   }
 
   dependencies {
     classpath group: 'org.jruby', name: 'jruby-complete', version: "9.2.11.0"
-    classpath 'gradle.plugin.com.github.jengelman.gradle.plugins:shadow:7.0.0'
     classpath 'de.undercouch:gradle-download-task:4.0.4'
   }
 }
 
+// apply plugin: 'com.github.johnrengelman.shadow'
+plugins {
+  id 'com.github.johnrengelman.shadow' version '8.1.1'
+
+  id 'java'
+  id 'maven-publish'
+  id 'distribution'
+  id 'idea'
+}
+
+
+
+group "org.logstash.filters"
+version Files.readAllLines(Paths.get("version")).first()
+
+java {
+  sourceCompatibility = JavaVersion.VERSION_1_8
+}
+
 repositories {
   mavenCentral()
 }
@@ -71,6 +79,11 @@ task patchYaml(type: Copy, dependsOn: [downloadYaml]) {
   }
 }
 
+// testJava tasks uses the patched yaml, so make explicit the dependency.
+tasks.getByPath(":compileTestJava").configure {
+  dependsOn patchYaml
+}
+
 task downloadTestYaml(type: Download, overwrite: false) {
   src([
     yamlResourceRoot + '/test_resources/additional_os_tests.yaml',
@@ -115,11 +128,9 @@ test {
   }
 }
 
-apply plugin: 'com.github.johnrengelman.shadow'
-
 shadowJar {
   dependsOn 'verifyYaml'
-  archiveClassifier = null
+  archiveClassifier.set('')
 }
 
 task vendor(dependsOn: shadowJar) {

gradle/wrapper/gradle-wrapper.jar

@@ -1,5 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists