compat: Update forward compatibility horizon to 2021-02-21
PiperOrigin-RevId: 358651970 Change-Id: I60dd1ecef73fb9eabf6adb5d715fb2e5b414eea5
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PiperOrigin-RevId: 358651970 Change-Id: I60dd1ecef73fb9eabf6adb5d715fb2e5b414eea5