ci: the 'ty' typechecking is failing

[jayaddison]

Describe the bug

Recently typechecking with Astral's ty utility was added to our GitHub Actions workflows in #14129.

However, currently ty v0.0.8 is reporting a few errors that cause pull requests to be flagged as failed.

Note: one of the errors/reports from the tool is in fact a note that there is a likely typo/config error in its own ty.toml config file:

warning[unknown-rule]: Unknown rule `non-subscriptable`. Did you mean `not-subscriptable`?
  --> ty.toml:25:1
   |
23 | invalid-assignment = "ignore"
24 | invalid-method-override = "ignore"
25 | non-subscriptable = "ignore"
   | ^^^^^^^^^^^^^^^^^
26 | possibly-missing-attribute = "ignore"

How to Reproduce

Recent pull requests and commits have encountered this problem, and until it is resolved, I expect new pull requests to too. For example:

• Fixes for "rST primer" hyperlinks section. #14237
  • https://github.com/sphinx-doc/sphinx/actions/runs/20623514431/job/59229959377
• cc7c6f4
  • https://github.com/sphinx-doc/sphinx/actions/runs/20623514431/job/59229959377

Installing ty locally - for example, using pip install ty within a virtualenv - and then running ty check also replicates the problem.

Environment Information

N/A

Sphinx extensions

N/A

Additional context

No response

Edit: add ty version number, and local repro steps.