rate-limit: avoid a crash in some rare occasion

If the _RateLimitEvent pushed on the heap are similar enough, they info will be compared, and we need them to be comparable otherwise we get a traceback.

Jenkins job DWCLI/gitlab-builds #63 succeeded .
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approved this merge request

@anlambert I don't have the merge right on this project, so If you approve it, you need to merge it too

Done.

merged