Update fig.grd baseline images for GMT 6.2.0rc1

[weiji14]

Description of proposed changes

Updates broken tests on GMT 6.2.0rc1 for fig.grdcontour, fig.grdfilter and pygmt.grd2cpt.

Note that the tests for fig.grdfilter are updates to the min/max values of the grid (and not baseline images). In GMT 6.1.1, the min/max values of a grdfiltered xarray.DataArray grid was slightly different to that of a NetCDF grid by a few decimal places (see #809), but this appears to be fixed so that the min/max values are exactly the same in GMT 6.2.0rc1 now. This resolves #859 I think, (originally fixed upstream at GenericMappingTools/gmt#5107).

This PR should also:

• Resolve Geographic xarray.DataArray grid is plotted as Cartesian grid #1172 as geographic xarray.DataArray grids should now be plotted as Geographic grids instead of Cartesian grids.
• Resolve Figure.grdcontour crashes for GMT dev (the upcoming v6.2.0) #1177 as the fig.grdcontour tests doesn't crash anymore with the upstream fix at The gmtlib_validate_id function stepped on another object's family gmt#5100.

Addresses #1217

Reminders

• Run make format and make check to make sure the code follows the style guide.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Add new public functions/methods/classes to doc/api/index.rst.
• Write detailed docstrings for all functions/methods.
• If adding new functionality, add an example to docstrings or tutorials.

Slash Commands

You can write slash commands (/command) in the first line of a comment to perform
specific operations. Supported slash commands are:

• /format: automatically format and lint the code
• /test-gmt-dev: run full tests on the latest GMT development version

[github-actions]

Summary of changed images

This is an auto-generated report of images that have changed on the DVC remote

Status	Path
modified	pygmt/tests/baseline/test_grd2cpt.png
modified	pygmt/tests/baseline/test_grdcontour.png
modified	pygmt/tests/baseline/test_grdcontour_file.png
modified	pygmt/tests/baseline/test_grdcontour_interval_file_full_opts.png
modified	pygmt/tests/baseline/test_grdcontour_labels.png
modified	pygmt/tests/baseline/test_grdcontour_slice.png

Image diff(s)

Added images

Modified images

Path	Old	New
test_grd2cpt.png
test_grdcontour.png
test_grdcontour_file.png
test_grdcontour_interval_file_full_opts.png
test_grdcontour_labels.png
test_grdcontour_slice.png

Report last updated at commit c93cc99