SpringBoot DevTools sets deprecated spring.mustache.cache property

Spring Boot 2.7 RC1, on startup, issues the following warning:

The use of configuration keys that have been renamed was found in the environment:

Property source 'devtools':
        Key: spring.mustache.cache
                Replacement: spring.mustache.servlet.cache


Each configuration key has been temporarily mapped to its replacement for your convenience. To silence this 
warning, please update your configuration to use the new keys.

As the message suggests, this seems to be issued by the "DevTools" property source, and spring.mustache.cache should be replaced with spring.mustache.servlet.cache, to avoid configuration warnings on startup.

Comment From: bclozel

See #30273

Comment From: wilkinsona

Thanks very much, @mmoayyed.