Gpg-keys for repo.mysql.com are EXPIRED

Feedback & Bug Reports
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https://circleci.com/gh/leo-yuriev/libfptu/86
[…]
GPG error: http://repo.mysql.com trusty InRelease: The following signatures were invalid: KEYEXPIRED 1487236823 KEYEXPIRED 1487236823 KEYEXPIRED 1487236823

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We do not control this repository. Please file a bug upstream or wait for mysql/ubuntu to update this key.

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