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-context/src/main/java/org/springframework/scripting/bsh/package-info.java

@@ -1,6 +1,6 @@
 /**
  * Package providing integration of
- * <a href="http://www.beanshell.org">BeanShell</a>
+ * <a href="https://beanshell.github.io/">BeanShell</a>
  * (and <a href="https://code.google.com/p/beanshell2/">BeanShell2</a>)
  * into Spring's scripting infrastructure.
  */

spring-context/src/main/java/org/springframework/scripting/groovy/package-info.java

@@ -1,6 +1,6 @@
 /**
  * Package providing integration of
- * <a href="http://www.groovy-lang.org/">Groovy</a>
+ * <a href="https://www.groovy-lang.org/">Groovy</a>
  * into Spring's scripting infrastructure.
  */
 @NonNullApi