NEP29: Test PyGMT on NumPy 1.22

[weiji14]

Description of proposed changes

Bumps numpy from 1.21.4 to 1.22.0 released on 31 December 2021.

• Release notes
• Changelog
• Commits

This is in line with PyGMT's policy on NEP29 at https://www.pygmt.org/v0.5.0/maintenance.html#dependencies-policy, xref #1074.

Note that the branch protection rules at https://github.com/GenericMappingTools/pygmt/settings/branches will need to be changed to use Python 3.9/Numpy 1.22 instead of Python 3.9/Numpy 1.21 before this Pull Request is merged.

Supersedes #1355

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.

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