Closes gh-7384

* pr/7370:
  Upgrade Thymeleaf 3 layout dialect in doc

Closes gh-7370

See gh-7108

* gh-7323:
  Upgrade to Log4j 2.7

Closes gh-7323

Closes gh-7355

Closes gh-7359

Closes gh-7366

The CloudFoundryHealthMvcEndpoint does not perform additional
security checks since security is handled by the interceptor.

See gh-7108

See gh-7108

Closes gh-7347

Artemis's on-demand queue cretaion appears to be rather flakey,
sometimes failing with a NullPointerException.

This commit ensures that the queue used by the sample is created
during start up rather than on demand. This will hopefully make the
test that runs the sample more robust.

Closes gh-7346

The changes made in 6a2ac080 mean that getSecurity() on
ManagementServerProperties will no longer return null when Spring
Security is on the classpath. This had the unwanted side-effect of
causing the health endpoint to hide its details when Spring Security
was not on the classpath.

This commit reinstates the previous behaviour by only considering
the health endpoint to be secure if Spring Security is on the
classpath and management.security.enabled is true.

Closes gh-7345

Closes gh-7334

* gh-7334:
  Reinstate LaunchedURLClassLoader's registration  as parallel capable

Closes gh-7334

This commits makes sure that customizations on `DispatcherServlet` are
also applied to the `TestDispatcherServlet` that `MockMvc` is using
internally.

Closes gh-5891

Closes gh-7343

Closes gh-7213

Closes gh-7342