updated to v2.0.0-a.2, downgraded to java 21

pom.xml

@@ -8,12 +8,12 @@
     <parent>
         <groupId>org.bioimageanalysis.icy</groupId>
         <artifactId>pom-icy</artifactId>
-        <version>3.0.0-a.1</version>
+        <version>3.0.0-a.4</version>
     </parent>
 
     <!-- Project Information -->
     <artifactId>ruler-helper</artifactId>
-    <version>2.0.0-a.1</version>
+    <version>2.0.0-a.2</version>
 
     <name>Ruler Helper</name>
     <description>Widget to measure distances over images considering current image scale.</description>
@@ -50,12 +50,4 @@
             </roles>
         </developer>
     </developers>
-
-    <!-- Icy Maven repository (to find parent POM) -->
-    <repositories>
-        <repository>
-            <id>icy</id>
-            <url>https://nexus-icy.pasteur.cloud/repository/icy/</url>
-        </repository>
-    </repositories>
 </project>
\ No newline at end of file