Add Gradle version check to prevent usage of deprecated settingsFile property

Author: IRus

src/main/groovy/net/researchgate/release/ReleasePlugin.groovy

@@ -104,6 +104,10 @@ class ReleasePlugin extends PluginHelper implements Plugin<Project> {
             startParameter.projectProperties.putAll(project.getGradle().startParameter.projectProperties)
             startParameter.projectProperties.put('release.releasing', "true")
             startParameter.projectDir = project.projectDir
+            if (GradleVersion.current() < GradleVersion.version("9.0")) {
+                // Setting custom settings file for the build has been deprecated.
+                startParameter.settingsFile = project.getGradle().startParameter.settingsFile
+            }
             startParameter.gradleUserHomeDir = project.getGradle().startParameter.gradleUserHomeDir
             buildName = project.name