Update baseline images for plot tests

[michaelgrund]

Description of proposed changes

Address #2961.

Only minor changes due to gs version bumping.

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 wrapping a new module, open a 'Wrap new GMT module' issue and submit reasonably-sized PRs.
• If adding new functionality, add an example to docstrings or tutorials.
• Use underscores (not hyphens) in names of Python files and directories.

Slash Commands

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

• /format: automatically format and lint the code

[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_plot_colors.png
modified	pygmt/tests/baseline/test_plot_colors_sizes.png
modified	pygmt/tests/baseline/test_plot_colors_sizes_proj.png
modified	pygmt/tests/baseline/test_plot_dataframe_incols.png
modified	pygmt/tests/baseline/test_plot_datetime.png
modified	pygmt/tests/baseline/test_plot_from_file.png
modified	pygmt/tests/baseline/test_plot_lines_with_arrows.png
modified	pygmt/tests/baseline/test_plot_matrix.png
modified	pygmt/tests/baseline/test_plot_matrix_color.png
modified	pygmt/tests/baseline/test_plot_ogrgmt_file_multipoint_default_style.png
modified	pygmt/tests/baseline/test_plot_ogrgmt_file_multipoint_non_default_style.png
modified	pygmt/tests/baseline/test_plot_projection.png
modified	pygmt/tests/baseline/test_plot_red_circles.png
modified	pygmt/tests/baseline/test_plot_scalar_xy.png
modified	pygmt/tests/baseline/test_plot_shapefile.png
modified	pygmt/tests/baseline/test_plot_sizes.png
modified	pygmt/tests/baseline/test_plot_sizes_colors_transparencies.png
modified	pygmt/tests/baseline/test_plot_varying_intensity.png
modified	pygmt/tests/baseline/test_plot_varying_transparency.png
modified	pygmt/tests/baseline/test_plot_vectors.png

Image diff(s)

Added images

Modified images

Path	Old	New
test_plot_colors.png
test_plot_colors_sizes.png
test_plot_colors_sizes_proj.png
test_plot_dataframe_incols.png
test_plot_datetime.png
test_plot_from_file.png
test_plot_lines_with_arrows.png
test_plot_matrix.png
test_plot_matrix_color.png
test_plot_ogrgmt_file_multipoint_default_style.png
test_plot_ogrgmt_file_multipoint_non_default_style.png
test_plot_projection.png
test_plot_red_circles.png
test_plot_scalar_xy.png
test_plot_shapefile.png
test_plot_sizes.png
test_plot_sizes_colors_transparencies.png
test_plot_varying_intensity.png
test_plot_varying_transparency.png
test_plot_vectors.png

Report last updated at commit 7a11d42