Bump ASM to 9.4, supporting Java 20 class files

Even though we just upgraded to 9.3 for Java 19, it does not hurt to
have ASM recognise the Java 20 class file major version.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

pom.xml

@@ -22,7 +22,7 @@
 
 		<!-- Dependency versions -->
 		<jdt.core.version>1.9.19-SNAPSHOT</jdt.core.version>
-		<asm.version>9.3</asm.version>
+		<asm.version>9.4</asm.version>
 		<lib.ant.version>1.6.3</lib.ant.version>
 		<lib.ant.xerces.version>2.6.2</lib.ant.xerces.version>
 		<lib.regexp.version>1.2</lib.regexp.version>