[ACL-296] Fix snapshot repo release 403 error by migrating to vanniktech maven publish plugin

- Replace nexus-publish-plugin with com.vanniktech.maven.publish plugin
- Simplify publishing configuration and remove manual signing setup
- Update gradle tasks to use new task registration syntax
- Bump version to 17.3.1

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: dili91

build.gradle

@@ -4,17 +4,13 @@ plugins {
     id "io.freefair.lombok" version "8.13.1"
     // to make our tests output more fancy
     id 'com.adarshr.test-logger' version '4.0.0'
-    // to publish packages
-    id 'maven-publish'
     // code linting
     id "com.diffplug.spotless" version "7.0.3"
     //  test coverage
     id 'jacoco'
     id 'com.github.kt3k.coveralls' version '2.12.2'
-    // signing
-    id "signing"
-    // nexus publishing
-    id "io.github.gradle-nexus.publish-plugin"  version "2.0.0"
+    // Maven central publishing
+    id "com.vanniktech.maven.publish" version "0.34.0"
 }
 
 compileJava {
@@ -28,7 +24,8 @@ spotless {
     }
 }
 
-task createProperties(dependsOn: processResources) {
+tasks.register('createProperties') {
+    dependsOn processResources
     doLast {
         file("${layout.buildDirectory.get()}/resources/main/truelayer-java.version.properties").withWriter { w ->
             Properties p = new Properties()
@@ -147,66 +144,43 @@ jacocoTestReport {
     }
 }
 
-task sourcesJar(type: Jar) {
+tasks.register('sourcesJar', Jar) {
     from sourceSets.main.allJava
     archiveClassifier = 'sources'
 }
 
-task javadocJar(type: Jar) {
+tasks.register('javadocJar', Jar) {
     from javadoc
     archiveClassifier = 'javadoc'
 }
 
-publishing {
-    publications {
-        mavenJava(MavenPublication) {
-            from(components.java)
-            artifact sourcesJar
-            artifact javadocJar
-
-            pom {
-                name = project_name
-                packaging = 'jar'
-                description = project_description
-                url = project_url
-                scm {
-                    connection = project_scm
-                    developerConnection = project_scm
-                    url = project_url
-                }
-                licenses {
-                    license {
-                        name = project_license_name
-                        url = project_license_url
-                    }
-                }
-                developers {
-                    developer {
-                        id = project_developer
-                        name = project_developer
-                    }
-                }
-            }
-        }
-    }
-}
+mavenPublishing {
+    publishToMavenCentral()
 
-ext.isReleaseVersion = !version.endsWith("SNAPSHOT")
-signing {
-    def signingKey = System.getenv('SONATYPE_GPG_KEY')
-    def signingPassword = System.getenv('SONATYPE_GPG_PASSPHRASE')
-    useInMemoryPgpKeys(signingKey, signingPassword)
-    sign publishing.publications.mavenJava
-    required { isReleaseVersion && gradle.taskGraph.hasTask("publish") }
-}
+    //signAllPublications()
 
-nexusPublishing {
-    repositories {
-        sonatype {
-            nexusUrl = uri(sonatype_repository_url)
-            snapshotRepositoryUrl = uri(sonatype_snapshot_repository_url)
-            username = System.getenv("SONATYPE_USERNAME")
-            password = System.getenv("SONATYPE_PASSWORD")
+    pom {
+        name = project_name
+        packaging = 'jar'
+        description = project_description
+        url = project_url
+        scm {
+            connection = project_scm
+            url = project_url
+        }
+        licenses {
+            license {
+                name = project_license_name
+                url = project_license_url
+                distribution = project_license_url
+            }
+        }
+        developers {
+            developer {
+                id = developer_name
+                name = developer_name
+                url = developer_url
+            }
         }
     }
 }

gradle.properties

@@ -1,15 +1,14 @@
 # Main properties
 group=com.truelayer
 archivesBaseName=truelayer-java
-version=17.3.0
+version=17.3.1
 
 # Artifacts properties
-sonatype_repository_url=https://s01.oss.sonatype.org/service/local/
-sonatype_snapshot_repository_url=https://s01.oss.sonatype.org/content/repositories/snapshots/
 project_name=TrueLayer Java
 project_description=TrueLayer Java SDK for https://truelayer.com
 project_url=https://github.com/TrueLayer/truelayer-java
+project_scm=scm:git:https://github.com/TrueLayer/truelayer-java.git
 project_license_url=https://raw.githubusercontent.com/TrueLayer/truelayer-java/main/LICENSE
 project_license_name=MIT License
-project_developer=truelayer
-project_scm=scm:git:https://github.com/TrueLayer/truelayer-java.git
+developer_name=truelayer
+developer_url=https://github.com/TrueLayer