Revert "upgrade graaljs version"

This reverts commit bdf6df5fe04c5dab07f0982c12e870763f8feb46.
diff --git a/fetch.xml b/fetch.xml
index 85bbf75..599b8f2 100644
--- a/fetch.xml
+++ b/fetch.xml
@@ -328,7 +328,7 @@
 
   <target name="graal.js"
           description="load Graal.js">
-    <f2 project="org.graalvm.js" archive="js-language"/>
+    <f2 project="org.graalvm.js" archive="js"/>
     <f2 project="org.graalvm.js" archive="js-scriptengine"/>
   </target>
 
diff --git a/lib/libraries.properties b/lib/libraries.properties
index 3ce11b3..8be814b 100644
--- a/lib/libraries.properties
+++ b/lib/libraries.properties
@@ -42,8 +42,8 @@
 commons-net.version=3.10.0
 commons-logging.version=1.1
 commons-logging-api.version=${commons-logging.version}
-js-language.version=23.1.2
-js-scriptengine.version=${js-language.version}
+js.version=20.1.0
+js-scriptengine.version=${js.version}
 # Note - When updating the hamcrest versions here, make sure to also update the
 # "src-dist" target in build.xml to copy the correct hamcrest jars
 # into the source distribution. Also update the hamcrest dependency