Fix gradle build file

Author: gbaudic

build.gradle

@@ -1,3 +1,5 @@
+import org.cyclonedx.model.ProjectType
+
 plugins {
   id "java"
   id "eclipse"
@@ -38,7 +40,7 @@ sonar {
 }
 
 tasks.cyclonedxDirectBom {
-    projectType = "application"
+    projectType = ProjectType.APPLICATION
     includeConfigs = listOf("runtimeClasspath")
     licenseChoice = LicenseChoice().apply {
         addLicense(License().apply {