[DRE-maint] Bug#851317: these tests are disabled in last upload

[Santiago Vila]

found 851317 0.6.3-4
thanks

Hi.

Sorry for the reopening but this issue does not seem to be fixed in
version 0.6.3-4. See this for example:

https://tests.reproducible-builds.org/debian/rbuild/buster/amd64/ruby-sidekiq-cron_0.6.3-4.rbuild.log.gz

(And I also still get the same error randomly in my own autobuilders).

Thanks.