Properly create IJavaProject in JpmsConfigurationTest

The pattern used to cast java nature to java project is wrong and we
have seen it used in many places but broke for some reason with 2024-03.
This reduces the failing tests of
#1720 .

Author: akurtakov

org.eclipse.m2e.jdt.tests/src/org/eclipse/m2e/jdt/tests/JpmsConfigurationTest.java

@@ -75,7 +75,7 @@ public void testFileChangeUpdatesJPMSSettings() throws CoreException, IOExceptio
     waitForJobsToComplete();
 
     // At start, check all attributes are empty
-    IJavaProject javaProject = (IJavaProject) project.getNature(JavaCore.NATURE_ID);
+	IJavaProject javaProject = JavaCore.create(project);
     Map<String, String> jreAttributes = Utils.getJreContainerAttributes(javaProject);
     Map<String, String> m2eAttributes = Utils.getM2eContainerAttributes(javaProject);