[ci] Jenkins restart Tuesday 3/21/22

We’re planning to integrate some updates to the infrastructure in https://github.com/tlc-pack/ci and https://github.com/tlc-pack/ci-terraform that requires a restart of Jenkins at https://ci.tlcpack.ai/. We plan to do this around 3/21/22 at 10:00 AM PDT (5:00 PM UTC). In-progress jobs will be cancelled and (hopefully) restarted automatically, so CI runtimes may be longer than usual by an hour or two.