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What this PR does
The current version (2.4.0) was released in December 2015. Since then three releases have been made including CVE fixes and some features. Ivy 2.5+ requires Java 8 as the minimum version and includes new features like the ability to depend on timestamped SNAPSHOTs.
Testing this PR
The CI builds should still be passing and build the OMERO components. The artifacts and the resolved dependencies should be unmodified and can be compared directly to a build of OMERO without this change. All integration tests should be unaffected
Related reading
See https://ant.apache.org/ivy/history/2.5.0/release-notes.html, https://ant.apache.org/ivy/history/2.5.1/release-notes.html and and https://ant.apache.org/ivy/history/2.5.2/release-notes.html for the list of associated changes