[#2562] Avoid cache update due to metadata change
[#2562] Avoid cache update due to metadata change

When pushing the .jar file to clojars, a new file gets created:
`maven-metadata-clojars.xml.sha1` this triggers the CI cache to
be refreshed

akvo/akvo-flow,akvo/akvo-flow,akvo/akvo-flow,akvo/akvo-flow,akvo/akvo-flow