docs: update CONTRIBUTING.md for pydantic/httpx2 migration

Merged
DR
3mo ago
+11-13

Summary

Replace all stale encode/httpx references in CONTRIBUTING.md with pydantic/httpx2:

  • Update issue/PR/discussion links → github.com/pydantic/httpx2
  • Update fork/clone/cd instructions (httpx → httpx2)
  • Update three embedded CI screenshot image URLs (encode/httpx/master → pydantic/httpx2/main)
  • Update compare link and branch ref (master → main)
  • Remove stale __version__.py version-bump instruction; replace with a note that versioning is managed via git tags and uv-dynamic-versioning
  • Remove stale PR example link (encode/httpx/pull/1006)
  • Update new-release link → pydantic/httpx2/releases/new

Test plan

  • All links in CONTRIBUTING.md resolve to github.com/pydantic/httpx2
  • Release section accurately describes the uv-dynamic-versioning / git-tag workflow