Fix server signal handling

Dependencies

• [2] 2WEO7OZL Version updates: getting rid of anyhow + moving to Tokio 1.0
• [3] 7FRJYUI6 Reboot because of a bad change

Change contents

• edit in thrussh/src/server/encrypted.rs at line 702
  [3.257698]→[2.11094:11178](∅→∅)
  − r.read_byte().map_err(crate::Error::from)?; // should be 0.