Remove the need to update var/gradle_dependencies_version
Currently we need to update var/gradle_dependencies_version each time gradle-dependencies-list.txt is updated.
If you change gradle-dependencies-list.txt without updating var/gradle_dependencies_version, then you can easily end up with the wrong list of gradle dependencies being used in a build.
To avoid this we should see if we can make the gradle dependencies be fetched again automatically when gradle-dependencies-list.txt has been updated, without the need to update var/gradle_dependencies_version.
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