timezone data: update to 2020d

Update timezone data to 2020d

2020b: http://mm.icann.org/pipermail/tz-announce/2020-October/000059.html
     Macquarie Island has stayed in sync with Tasmania since 2011.
     Casey, Antarctica is at +08 in winter and +11 in summer.

2020c: http://mm.icann.org/pipermail/tz-announce/2020-October/000060.html

2020d: http://mm.icann.org/pipermail/tz-announce/2020-October/000062.html
     Palestine ends DST earlier than predicted, on 2020-10-24.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>