Changes made in conjunction with #27497 now require that we generate
Javadoc with JDK 18 or higher in order to make use of the
"--link-modularity-mismatch" flag for the javadoc executable.
This commit sets the toolchain for the javadoc task in the
framework-api module to use JDK 24 for generating Javadoc.
The common javadoc task used by all spring-* modules will be addressed
in a separate commit.
See gh-27497
See gh-34774
49ef150c5d