[ty] Fix method calls on subclasses of `Any` (#23248)
## Summary
Another small win in terms of typing conformance. This should fix the
last remaining test in
[`specialtypes_any.py`](https://shark.fish/typing-conformance-report/specialtypes_any.html)
## Ecosystem
The new diagnostics look like true positives (in our current strict
interpretation of LSP checks)
## Test Plan
New Markdown test
