Replace deprecated :rubygems source
Fix deprecation warnings thrown by bundler: The source :rubygems is deprecated because HTTP requests are insecure. Please change your source to 'https://rubygems.org' if possible, or 'http://rubygems.org' if not. Fixes: bug #1175767 Change-Id: I10227cd21b36f8dd7e575e5e630d3d4823333417
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