Security update for rubygem-excon

This update for rubygem-excon fixes the following issues:

CVE-2019-16779 (boo#1159342):
Fix a race condition around persistent connections, where a connection,
which was interrupted, would leave data on the socket.
Subsequent requests would then read this data, returning content from the previous response.

This update was imported from the openSUSE:Leap:15.1:Update update project.

Fixed bugs
bnc#1159342
VUL-1: CVE-2019-16779: rubygem-excon: race condition around persistent connections, where a connection which is interrupted would leave data on the socket
Selected Binaries
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