[ironic] End of year meeting schedule

Greetings everyone, Today, during the Ironic team meeting, we reached consensus[0] that we would not hold meetings during the last half of December and for the first week of January. Much as we've done the past few years to give contributors time they can feel safe taking off without missing any meetings, coupled with end of year PTO usage and holidays. We will resume our regular meetings on January 10th, 2022. Dates of cancelled meetings: * December 20th, 2021 * December 27th, 2021 * January 3rd, 2022 Hopefully everyone will get plenty of rest, and be ready to review plenty of code when they get back! Thanks, -Julia [0]: https://meetings.opendev.org/meetings/ironic/2021/ironic.2021-11-29-15.00.lo...