there are different space characters used in java 21 (narrow space)

--- a/stringtemplate4-ST4-4.3.4/test/org/stringtemplate/v4/test/TestRenderers.java
+++ b/stringtemplate4-ST4-4.3.4/test/org/stringtemplate/v4/test/TestRenderers.java
@@ -77,6 +77,8 @@ public class TestRenderers extends BaseTest {
         String expecting = "datetime: 7/5/05, 12:00 AM";
         if ( javaVersion.startsWith("1.6") || javaVersion.startsWith("1.7") || javaVersion.startsWith("1.8") ) {
             expecting = "datetime: 7/5/05 12:00 AM";
+        } else if ( javaVersion.startsWith("21") ) {
+            expecting = "datetime: 7/5/05, 12:00 AM";
         }
         String result = st.render();
         assertEquals(expecting, result);
@@ -106,6 +108,8 @@ public class TestRenderers extends BaseTest {
         String expecting = " datetime: 7/5/05, 12:00 AM ";
         if ( javaVersion.startsWith("1.6") || javaVersion.startsWith("1.7") || javaVersion.startsWith("1.8") ) {
             expecting = " datetime: 7/5/05 12:00 AM ";
+        } else if ( javaVersion.startsWith("21") ) {
+            expecting = " datetime: 7/5/05, 12:00 AM ";
         }
         String result = st.render();
         assertEquals(expecting, result);
@@ -126,6 +130,8 @@ public class TestRenderers extends BaseTest {
             String expecting = " datetime: Tuesday, July 5, 2005 at 12:00:00 AM Pacific Daylight Time ";
             if ( javaVersion.startsWith("1.6") || javaVersion.startsWith("1.7") || javaVersion.startsWith("1.8") ) {
                 expecting = " datetime: Tuesday, July 5, 2005 12:00:00 AM PDT ";
+            } else if ( javaVersion.startsWith("21") ) {
+                expecting = " datetime: Tuesday, July 5, 2005, 12:00:00 AM Pacific Daylight Time ";
             }
             String result = st.render();
             assertEquals(expecting, result);
@@ -160,6 +166,9 @@ public class TestRenderers extends BaseTest {
         ST st = group.getInstanceOf("dateThing");
         st.add("created", new GregorianCalendar(2005, 7 - 1, 5));
         String expecting = " time: 12:00:00 AM ";
+        if ( javaVersion.startsWith("21") ) {
+            expecting = " time: 12:00:00 AM ";
+        }
         String result = st.render();
         assertEquals(expecting, result);
     }