Use Any as context annotation in plugin API

[Viicos]

Change Summary

To wrap up #12279.

Related issue number

Checklist

• The pull request title is a good summary of the changes - it will be used in the changelog
• Unit tests for the changes exist
• Tests pass on CI
• Documentation reflects the changes where applicable
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

[cloudflare-workers-and-pages]

Deploying pydantic-docs with    Cloudflare Pages

Latest commit:	f88a60d
Status:	✅  Deploy successful!
Preview URL:	https://3f2aa266.pydantic-docs.pages.dev
Branch Preview URL:	https://context-plugin-any.pydantic-docs.pages.dev

View logs

[github-actions]

Coverage report

This PR does not seem to contain any modification to coverable code.

[codspeed-hq]

CodSpeed Performance Report

Merging #12341 will not alter performance

_{Comparing context-plugin-any (f88a60d) with main (3f59a03)}

Summary

✅ 46 untouched