chore: prepare 0.12.1 patch release

[gregnazario]

Prepares the 0.12.1 patch release of aptos-sdk, following the release steps in CONTRIBUTING.md.

Changes

• Bump version in pyproject.toml from 0.12.0 to 0.12.1 (and the corresponding entry in uv.lock via uv lock).
• Cut the Unreleased changelog content into a dated ## 0.12.1 (2026-08-13) section.

Everything landed on main since the 0.12.0 release prep is backwards compatible (localnet/e2e test reliability plus dependency updates), so a patch bump is the right increment — no public API changed.

Changelog section

Changed

• Make e2e / localnet examples more reliable: aggregator_value reads both OptionalAggregator variants (aggregator table and integer, as used on localnet), REST and faucet calls retry transient 429/5xx and faucet sequence-number races, and the integration harness waits for the node and reloads network env vars after starting a localnet.
• Update dependencies: aiohttp 3.14.3, h2 4.4.1, and cryptography 50.0.0 (both the root SDK and the standalone v2 package), plus a full lockfile refresh.

The standalone v2 package version (v2/pyproject.toml, 0.1.0) is intentionally left alone — it is versioned and published separately and had no source changes in this window.

Verification

• uv run python -m unittest discover -s aptos_sdk/ -p '*.py' -t .. — 169 tests, OK
• uv run behave — 3 features / 248 scenarios passed
• make lint — mypy clean on 132 files, ruff clean
• make fmt — no changes produced
• cd v2 && uv run ruff check src/ tests/ && uv run ruff format --check src/ tests/ — clean
• uv build — builds aptos_sdk-0.12.1.tar.gz and aptos_sdk-0.12.1-py3-none-any.whl, so the publish workflow's tag/version check will pass for tag v0.12.1

Remaining maintainer step

Publishing is automated but release creation is not: after this merges to main, create a GitHub Release from main with tag and title v0.12.1 and the 0.12.1 changelog section as the notes. Publishing the release triggers Publish aptos-sdk to PyPI.

  

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.07%. Comparing base (98498d5) to head (bfc2380).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #130   +/-   ##
=======================================
  Coverage   93.07%   93.07%           
=======================================
  Files          56       56           
  Lines        5239     5239           
=======================================
  Hits         4876     4876           
  Misses        363      363           

Flag	Coverage Δ		*Carryforward flag
v1-sdk	90.17% <ø> (ø)
v2-sdk	97.02% <ø> (ø)		Carriedforward from 98498d5

*This pull request uses carry forward flags. Click here to find out more.

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