Fix links in Javadoc and reference docs

- Fix broken links (by using a new URL, an alternative URL, or a
  Wayback Machine link)

- Use HTTPS where possible

- Remove https://issuetracker.springsource.com/browse/EBR-349: this
  link is dead and is also mentioned in
  https://jira.spring.io/browse/SPR-8093

- Clean up nohttp allowlist.lines

Closes gh-28876

spring-webmvc/src/main/java/org/springframework/web/servlet/view/groovy/GroovyMarkupConfigurer.java

@@ -80,7 +80,7 @@ import org.springframework.util.StringUtils;
  * @author Rossen Stoyanchev
  * @since 4.1
  * @see GroovyMarkupView
- * @see <a href="http://groovy-lang.org/templating.html#_the_markuptemplateengine">
+ * @see <a href="https://groovy-lang.org/templating.html#_the_markuptemplateengine">
  *     Groovy Markup Template engine documentation</a>
  */
 public class GroovyMarkupConfigurer extends TemplateConfiguration

spring-webmvc/src/main/java/org/springframework/web/servlet/view/groovy/GroovyMarkupView.java

@@ -47,7 +47,7 @@ import org.springframework.web.util.NestedServletException;
  * @since 4.1
  * @see GroovyMarkupViewResolver
  * @see GroovyMarkupConfigurer
- * @see <a href="http://groovy-lang.org/templating.html#_the_markuptemplateengine">
+ * @see <a href="https://groovy-lang.org/templating.html#_the_markuptemplateengine">
  * Groovy Markup Template engine documentation</a>
  */
 public class GroovyMarkupView extends AbstractTemplateView {

spring-webmvc/src/main/java/org/springframework/web/servlet/view/groovy/package-info.java

@@ -1,6 +1,6 @@
 /**
  * Support classes for the integration of
- * <a href="http://docs.groovy-lang.org/docs/next/html/documentation/template-engines.html#_the_markuptemplateengine">
+ * <a href="https://groovy-lang.org/templating.html#_the_markuptemplateengine">
  * Groovy Templates</a> as Spring web view technology.
  * Contains a View implementation for Groovy templates.
  */