Unblock “Check Changes” by documenting @typespec/http-client-python package changes

[Copilot]

The Check Changes GitHub Actions job was failing because chronus verify detected undocumented changes in @typespec/http-client-python. This PR adds the missing Chronus entry so release metadata changes are recognized by CI.

• Root cause

  • pnpm chronus verify --since main failed with:
    • The following packages have changes but are not documented.
    • @typespec/http-client-python

• Change made

  • Added a new changeset file under .chronus/changes/ for @typespec/http-client-python.
  • Marked the entry as internal, matching the scope of the package metadata/release bookkeeping change.

• Why this resolves CI

  • The Check Changes workflow gates on Chronus package documentation.
  • With the new entry present, the package diff is now classified as documented and no longer fails this gate.

---
changeKind: internal
packages:
  - "@typespec/http-client-python"
---

Document the 0.33.0 release package metadata updates for the Python emitter.