fix: Fix specialize_type_vars resolution for generic aliases

[bellini666]

While trying to debug strawberry-graphql/strawberry-django#535 I discovered this.

There's still another bug on strawberry-django itself, but it needs this to be fixed first.

[botberry]

Thanks for adding the RELEASE.md file!

Here's a preview of the changelog:

---

This release fixes an issue when trying to retrieve specialized type vars from a
generic type that has been aliased to a name, in cases like:

@strawberry.type
class Fruit(Generic[T]): ...


SpecializedFruit = Fruit[str]

Here's the tweet text:

🆕 Release (next) is out! Thanks to @_bellini666 for the PR 👏

Get it here 👉 https://strawberry.rocks/release/(next)

[patrick91]

Awesome!

[codspeed-hq]

CodSpeed Performance Report

Merging #3535 will not alter performance

_{Comparing specialized_type_var_map_for_aliases (4abca0d) with main (d934bfc)}

Summary

✅ 12 untouched benchmarks

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.35%. Comparing base (d934bfc) to head (4abca0d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3535      +/-   ##
==========================================
- Coverage   94.35%   94.35%   -0.01%     
==========================================
  Files         519      519              
  Lines       32318    32334      +16     
  Branches     3701     3703       +2     
==========================================
+ Hits        30494    30509      +15     
+ Misses       1542     1541       -1     
- Partials      282      284       +2