Deprecate old versions of TLS in Bitbucket Cloud HTTPS

While there was very little to be done technically - we just needed to change a few settings at the point of public TLS termination - we still needed to announce the deprecation well in advance; coordinate with support teams to ensure that as many customer questions as possible would be answered; and remind, remind, remind, remind those end users. Much of the work we did for Bitbucket Cloud was later adapted for Atlassian as a whole.

Later follow-up work on this front helped Bitbucket implement TLSv1.3, once it became available.

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Nifty tech tag lists fromĀ Wouter Beeftink