Bump GMT dev version from 6.4.0.dev5+b5e996c to 6.5.0.dev0+52d68ae

[weiji14]

This PR will update the following package:

• gmt from 6.4.0.dev5+b5e996c to 6.5.0.dev0+52d68ae
  • Full list of commits made since last release viewable at compare view

Notes for merging this PR:

1. Feel free to push to the bot's branch to update this PR if needed.
2. Checklist before merging this PR:

• Dependencies have been updated if changed
• Tests have passed

Supersedes #190.

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[weiji14]

@conda-forge-admin, please rerender

[weiji14]

@seisman, let me know if there has been any dependency related changes between GMT 6.4 to 6.5. I haven't been following the releases lately.