chore: prepare 0.12.1 patch release (#130)

Bump version to 0.12.1 and cut the Unreleased changelog entries into a
dated 0.12.1 section covering the localnet e2e reliability fixes and the
aiohttp/h2/cryptography dependency updates.

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

Author: gregnazario

CHANGELOG.md

@@ -4,7 +4,12 @@ All notable changes to the Aptos Python SDK will be captured in this file. This
 
 ## Unreleased
 
+## 0.12.1 (2026-08-13)
+
+### 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.
 
 ## 0.12.0 (2026-07-02)
 

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "aptos-sdk"
-version = "0.12.0"
+version = "0.12.1"
 description = "Aptos SDK"
 authors = [{ name = "Aptos Labs", email = "opensource@aptoslabs.com" }]
 license = {file = "LICENSE"}