SDK: release 1.21.2

[squioc]

This pull request introduces a minor release update for the project. The main change is a version bump to 1.21.2, along with the addition of a new unreleased section in the changelog to track upcoming changes.

Release management:

• Updated the version in pyproject.toml from 1.21.1 to 1.21.2 to reflect the new release.
• Added a new 1.21.2 - 2025-12-10 section in CHANGELOG.md to document changes for the upcoming release.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Release bump for the SDK to version 1.21.2, updating the package version metadata and adding a new changelog section for this release.

File-Level Changes

Change	Details	Files
Bump SDK package version to 1.21.2 in project metadata.	Update the poetry project version field from 1.21.1 to 1.21.2 in the package configuration.	pyproject.toml
Add a new 1.21.2 entry in the changelog.	Insert a new version heading for 1.21.2 with the release date under the Unreleased section of the changelog to start documenting changes for this release.	CHANGELOG.md

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.55%. Comparing base (5b483c9) to head (ed356c9).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #203   +/-   ##
=======================================
  Coverage   91.55%   91.55%           
=======================================
  Files          49       49           
  Lines        3187     3187           
=======================================
  Hits         2918     2918           
  Misses        269      269           

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[github-actions]

Test Results

258 tests  ±0   254 ✅ ±0   2m 2s ⏱️ -3s
  1 suites ±0     4 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit ed356c9. ± Comparison against base commit 5b483c9.