fix(dev-tools-nvim): capture new dependency on async

[hakamadare]

📑 Description

Per ThePrimeagen/refactoring.nvim#519, which announces a major rewrite,
plenary.nvim is no longer a dependency (which is good because that
library is apparently no longer maintained?), but now there's a
dependency on lewis6991/async.nvim.

📖 Additional Information

The community recipe in editing-support has captured this update, but
since I had configured this recipe but not the editing-support recipe,
I got a storm of tracebacks complaining about a missing async()
method.

[github-actions]

Review Checklist

Does this PR follow the [Contribution Guidelines](development guidelines)? Following is a partial checklist:

Proper conventional commit scoping:

• If you are adding a new plugin, the scope would be the name of the category it is being added into. ex. feat(utility): added noice.nvim plugin

• If you are modifying a pre-existing plugin or pack, the scope would be the name of the plugin folder. ex. fix(noice-nvim): fix LSP handler error

• Pull request title has the appropriate conventional commit type and scope where the scope is the name of the pre-existing directory in the project as described above

• README is properly formatted and uses fenced in links with <url> unless they are inside a [title](url)

• Entry returns a single plugin spec with the new plugin as the only top level spec (not applicable for recipes or packs).

• Proper usage of opts table rather than setting things up with the config function.

• Proper usage of specs table for all specs that are not dependencies of a given plugin (not applicable for recipes or packs).