Update java version

[muescha]

I have seen in videos using initializr-plusplus, but many times you set the java version manually from java 17 to java 21

Maybe this step can be done as an pom file command?

[dashaun]

@muescha You are correct!

I've been trying to move all of the features in this repo, over to a set of "User Defined Commands" for Spring CLI