build(deps): bump python-dotenv from 1.2.2 to 1.2.3 in /claude-agent-sdk

Bumps [python-dotenv](https://github.com/theskumar/python-dotenv) from 1.2.2 to 1.2.3.
- [Release notes](https://github.com/theskumar/python-dotenv/releases)
- [Changelog](https://github.com/theskumar/python-dotenv/blob/main/CHANGELOG.md)
- [Commits](theskumar/python-dotenv@v1.2.2...v1.2.3)

---
updated-dependencies:
- dependency-name: python-dotenv
  dependency-version: 1.2.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

claude-agent-sdk/pyproject.toml

@@ -8,7 +8,7 @@ dependencies = [
     "slack-cli-hooks==0.3.0",
     "claude-agent-sdk==0.2.135",
     "aiohttp==3.14.3",
-    "python-dotenv==1.2.2",
+    "python-dotenv==1.2.3",
 ]
 
 [project.optional-dependencies]