message: stederr redirect changed to append
diff: @@ -11,7 +11,7 @@ Type=simple
  ExecStartPre=/etc/casper/systemd_pre_start.sh
  #StandardOutput can only append log files from systemd version 240 + (Ubuntu 20.04). Use ExecStart with redirection as workaround.
  #seperate stderr logging as it outputs non-JSON stack traces
  -ExecStart=/bin/sh -c 'exec /usr/bin/casper-node validator /etc/casper/config.toml >> /var/log/casper/casper-node.log 2> /var/log/casper/casper-node.stderr.log'
  +ExecStart=/bin/sh -c 'exec /usr/bin/casper-node validator /etc/casper/config.toml 1>> /var/log/casper/casper-node.log 2>> /var/log/casper/casper-node.stderr.log'
  Restart=no
  User=casper
  Group=casper
  