有効期限切れのRoot CAを飲んでるのはexconの他にaws-sdk-coreがあった。
$ find vendor/bundle -type f -exec grep -l 'DST Root CA X3' {} +vendor/bundle/ruby/2.5.0/gems/excon-0.59.0/data/cacert.pemvendor/bundle/ruby/2.5.0/gems/aws-sdk-core-2.10.100/ca-bundle.crt
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