Update ASM version

PiperOrigin-RevId: 346894059
diff --git a/pom.xml b/pom.xml
index 582d720..3a688fa 100644
--- a/pom.xml
+++ b/pom.xml
@@ -31,7 +31,7 @@
   </description>
 
   <properties>
-    <asm.version>8.0</asm.version>
+    <asm.version>9.0</asm.version>
     <javac.version>9+181-r4173-1</javac.version>
     <guava.version>29.0-jre</guava.version>
   </properties>