message: Sort dashboards exported json
  It makes easier to review changes in dashboards and use git diff
diff: @@ -280,6 +280,10 @@ def decode_dashboards(o):
  class DashboardEncoder(json.JSONEncoder):
  + def __init__(self, *args, **kwargs):
  + super().__init__(*args, **kwargs)
  + self.sort_keys = True
  +
  # pylint: disable=E0202
  def default(self, o):
  try:
  @@ -288,7 +292,7 @@ class DashboardEncoder(json.JSONEncoder):
  except Exception:
  if type(o) == datetime:
  return {"__datetime__": o.replace(microsecond=0).isoformat()}
  - return json.JSONEncoder.default(self, o)
  + return json.JSONEncoder(sort_keys=True).default(self, o)
  def parse_human_timedelta(s: str) -> timedelta:
  