Align versions used in spring-boot-gradle-plugin

[philwebb]

Looking at the tests in /spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/bundling we have several that pull in old dependencies. We should probably try to align versions with the main build.

[sharoha]

What is the version that we are targeting in these test dependencies?

[scottfrederick]

@sharoha This issue is referring to Gradle build files used in tests for the Gradle plugin. Some of those test files use dependencies with hard-coded versions that aren't up-to-date, as in this example using Apache Commons and Spring Framework dependencies.

I don't think we would want to just update those versions to something more current, because they will quickly get out-of-date again. We should try to come up with a way to replace those hard-coded versions with versions supplied by Boot's build system.