Add setter on StrawberryAnnotation.annotation

[patrick91]

Fixes this issue on Strawberry Django:

AttributeError: property 'annotation' of 'StrawberryAnnotation' object has no setter

[codecov]

Codecov Report

Merging #2932 (d0d211c) into main (d96c665) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2932   +/-   ##
=======================================
  Coverage   96.17%   96.17%           
=======================================
  Files         211      211           
  Lines        9228     9231    +3     
  Branches     1706     1707    +1     
=======================================
+ Hits         8875     8878    +3     
  Misses        227      227           
  Partials      126      126           

[botberry]

Thanks for adding the RELEASE.md file!

Here's a preview of the changelog:

---

This release adds a setter on StrawberryAnnotation.annotation, this fixes
an issue on Strawberry Django.

---

Here's the preview release card for twitter:

Here's the tweet text:

🆕 Release (next) is out! Thanks to @patrick91 for the PR 👏

Get it here 👉 https://github.com/strawberry-graphql/strawberry/releases/tag/(next)