Update deprecated Gradle task creation

This commit replaces use of the deprecated Gradle `task` method with
the new `tasks.register` method.

Closes gh-34617

Signed-off-by: Dmitry Sulman <dmitry.sulman@gmail.com>

gradle/spring-module.gradle

@@ -87,14 +87,15 @@ javadoc {
 	logging.captureStandardOutput LogLevel.INFO  // suppress "## warnings" message
 }
 
-task sourcesJar(type: Jar, dependsOn: classes) {
+tasks.register('sourcesJar', Jar) {
+	dependsOn classes
 	duplicatesStrategy = DuplicatesStrategy.EXCLUDE
 	archiveClassifier.set("sources")
 	from sourceSets.main.allSource
 	// Don't include or exclude anything explicitly by default. See SPR-12085.
 }
 
-task javadocJar(type: Jar) {
+tasks.register('javadocJar', Jar) {
 	archiveClassifier.set("javadoc")
 	from javadoc
 }