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apache-nifi: fix `Could not acquire read lock` on postsubmit builds
We are seeing lots of errors in postsubmit builds:
java.lang.IllegalStateException: Attempt 1: Could not acquire read lock for 'artifact:org.apache.nifi:nifi-api:1.27.0' in 30 SECONDS
By removing parallel threads for arm as well this seems to make the build more reliable.