Deprecate the lang XML namespace

And remove the related reference documentation.

Closes gh-35719

spring-context/src/main/java/org/springframework/scripting/config/LangNamespaceHandler.java

@@ -36,7 +36,9 @@ import org.springframework.beans.factory.xml.NamespaceHandlerSupport;
  * @author Juergen Hoeller
  * @author Mark Fisher
  * @since 2.0
+ * @deprecated with no replacement as not actively maintained anymore
  */
+@Deprecated(since = "7.0")
 public class LangNamespaceHandler extends NamespaceHandlerSupport {
 
 	@Override

spring-context/src/main/java/org/springframework/scripting/config/LangNamespaceUtils.java

@@ -27,7 +27,9 @@ import org.springframework.scripting.support.ScriptFactoryPostProcessor;
  * @author Rob Harrop
  * @author Mark Fisher
  * @since 2.5
+ * @deprecated with no replacement as not actively maintained anymore
  */
+@Deprecated(since = "7.0")
 public abstract class LangNamespaceUtils {
 
 	/**

spring-context/src/main/java/org/springframework/scripting/config/ScriptBeanDefinitionParser.java

@@ -53,7 +53,9 @@ import org.springframework.util.xml.DomUtils;
  * @author Juergen Hoeller
  * @author Mark Fisher
  * @since 2.0
+ * @deprecated with no replacement as not actively maintained anymore
  */
+@Deprecated(since = "7.0")
 class ScriptBeanDefinitionParser extends AbstractBeanDefinitionParser {
 
 	private static final String ENGINE_ATTRIBUTE = "engine";

spring-context/src/main/java/org/springframework/scripting/config/ScriptingDefaultsParser.java

@@ -30,7 +30,9 @@ import org.springframework.util.StringUtils;
  *
  * @author Mark Fisher
  * @since 2.5
+ * @deprecated with no replacement as not actively maintained anymore
  */
+@Deprecated(since = "7.0")
 class ScriptingDefaultsParser implements BeanDefinitionParser {
 
 	private static final String REFRESH_CHECK_DELAY_ATTRIBUTE = "refresh-check-delay";