Make use of spring-boot.version property in Spring Boot dependencies. #4873
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By using the property in Spring Boot dependencies' pom.xml, even projects
that use the Spring Boot starter parent pom transitively can tweak the
version of the dependencies independently from the parent pom.
That might sound counterintuitive at first but image a project setup with
a company wide parent pom that uses Boot's as parent itself but only gets
released ocassionally (i.e. maybe per Boot generation 1.2, 1.3) etc. If
that's in place, the leaf projects cannot upgrade to a newer Spring Boot
version at all due to the way handles imports in
sections [0].
That change allows users to st the spring-boot.version property and thus
let Maven import the spring-boot-dependencies in the potentially newer
version so that the dependency upgrades can be pulled in even if the
reference to the parent isn't updated.
[0] https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html