[bugfix] Make build compatible with Java18 and beyond.

Author: dizzzz

exist-core/pom.xml

@@ -1067,9 +1067,9 @@ The BaseX Team. The original license statement is also included below.]]></pream
             </plugin>
 
             <plugin>
-                <groupId>org.codehaus.mojo</groupId>
+                <groupId>org.omnifaces</groupId>
                 <artifactId>antlr-maven-plugin</artifactId>
-                <version>2.2</version>
+                <version>2.3</version>
                 <configuration>
                     <grammars>
                         org/exist/xquery/parser/XQuery.g,org/exist/xquery/parser/XQueryTree.g,org/exist/xquery/parser/DeclScanner.g,org/exist/xquery/xqdoc/parser/XQDocParser.g

extensions/modules/simpleql/pom.xml

@@ -67,9 +67,9 @@
     <build>
         <plugins>
             <plugin>
-                <groupId>org.codehaus.mojo</groupId>
+                <groupId>org.omnifaces</groupId>
                 <artifactId>antlr-maven-plugin</artifactId>
-                <version>2.2</version>
+                <version>2.3</version>
                 <configuration>
                     <grammars>org/exist/xquery/modules/simpleql/SimpleQLParser.g</grammars>
                 </configuration>