* upstream/main: (291 commits)
  Update error message when saving multiindex (pydata#7475)
  DOC: cross ref the groupby tutorial (pydata#7555)
  [pre-commit.ci] pre-commit autoupdate (pydata#7543)
  supress namespace_package deprecation warning (doctests) (pydata#7548)
  [skip-ci] Add PDF of Xarray logo (pydata#7530)
  Support complex arrays in xr.corr (pydata#7392)
  clarification for thresh arg of dataset.dropna() (pydata#7481)
  [pre-commit.ci] pre-commit autoupdate (pydata#7524)
  Require to explicitly defining optional dimensions such as hue and markersize (pydata#7277)
  Use plt.rc_context for default styles (pydata#7318)
  Update HOW_TO_RELEASE.md (pydata#7512)
  Update whats-new for dev (pydata#7511)
  Fix whats-new for 2023.02.0 (pydata#7506)
  Update apply_ufunc output_sizes error message (pydata#7509)
  Zarr: drop "source" and  "original_shape" from encoding (pydata#7500)
  [pre-commit.ci] pre-commit autoupdate (pydata#7507)
  Whats-new for 2023.03.0
  Add `inclusive` argument to `cftime_range` and `date_range` and deprecate `closed` argument (pydata#7373)
  Make text match code example (pydata#7499)
  Remove Dask single-threaded setting in tests (pydata#7489)
  ...