default minimum now JDK15, transitioned to JDK17 LTS

nbproject/project.xml

@@ -87,11 +87,11 @@
             </view>
             <subprojects/>
         </general-data>
-        <java-data xmlns="http://www.netbeans.org/ns/freeform-project-java/4">
+        <java-data xmlns="http://www.netbeans.org/ns/freeform-project-java/5">
             <compilation-unit>
                 <package-root>lib</package-root>
                 <classpath mode="compile">lib/X3DJSAIL.4.0.full.jar</classpath>
-                <source-level>1.8</source-level>
+                <source-level>15</source-level>
             </compilation-unit>
         </java-data>
         <spellchecker-wordlist xmlns="http://www.netbeans.org/ns/spellchecker-wordlist/1">