Update Gradle wrapper to 8.11.1 and remove deprecated JavaPluginConve…

…ntion references

build.gradle

@@ -26,16 +26,12 @@ repositories {
 group = "com.pusher"
 version = "1.3.3"
 description = "Pusher HTTP Client"
-sourceCompatibility = "1.8"
-targetCompatibility = "1.8"
 
-ext.sharedManifest = manifest {
-    attributes(
-        'Created-By': 'Pusher',
-        'Implementation-Vendor': 'Pusher',
-        'Implementation-Title': 'Pusher HTTP Java',
-        'Implementation-Version': version
-    )
+java {
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_11
+    withSourcesJar()
+    withJavadocJar()
 }
 
 dependencies {
@@ -62,33 +58,16 @@ javadoc {
 
 jar {
     duplicatesStrategy = DuplicatesStrategy.EXCLUDE
-    manifest = project.manifest {
-        from sharedManifest
+    manifest {
+        attributes(
+                'Created-By': 'Pusher',
+                'Implementation-Vendor': 'Pusher',
+                'Implementation-Title': 'Pusher HTTP Java',
+                'Implementation-Version': version
+        )
     }
 }
 
-task sourcesJar(type: Jar, dependsOn: classes) {
-    archiveClassifier.set('sources')
-    from sourceSets.main.allSource
-}
-assemble.dependsOn sourcesJar
-
-
-task javadocJar(type: Jar, dependsOn: javadoc) {
-    archiveClassifier.set('javadoc')
-    from javadoc.destinationDir
-}
-assemble.dependsOn javadocJar
-
-artifacts {
-    archives jar, sourcesJar, javadocJar
-}
-
-java {
-    withSourcesJar()
-    withJavadocJar()
-}
-
 publishing {
     publications {
         mavenJava(MavenPublication) {

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists