Bump the GMT version to 6.5.0

[michaelgrund]

Description of proposed changes

Address #2961

Fixes #

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

[seisman]

No, we're still going to support GMT 6.3 and 6.4. So, the minimum required version is still 6.3.0.

[michaelgrund]

No, we're still going to support GMT 6.3 and 6.4. So, the minimum required version is still 6.3.0.

You mean in ci_tests_legacy.yaml?

[seisman]

required_version should be 6.3.0 so that PyGMT works with GMT 6.3, 6.4 and 6.5.

[seisman]

In other words, none of the changes in this PR make sense, so the PR should be closed.

[michaelgrund]

In other words, none of the changes in this PR make sense, so the PR should be closed.

Then we should remove the corresponding TODOs in #2961

[seisman]

In other words, none of the changes in this PR make sense, so the PR should be closed.

Then we should remove the corresponding TODOs in #2961

Yes, done.