Bump the python-security group across 1 directory with 2 updates

Bumps the python-security group with 2 updates in the / directory: [datamodel-code-generator](https://github.com/datamodel-code-generator/datamodel-code-generator) and [httpx2](https://github.com/pydantic/httpx2).


Updates `datamodel-code-generator` from 0.57.0 to 0.81.0
- [Release notes](https://github.com/datamodel-code-generator/datamodel-code-generator/releases)
- [Changelog](https://github.com/datamodel-code-generator/datamodel-code-generator/blob/main/CHANGELOG.md)
- [Commits](datamodel-code-generator/datamodel-code-generator@0.57.0...0.81.0)

Updates `httpx2` from 2.10.0 to 2.12.0
- [Release notes](https://github.com/pydantic/httpx2/releases)
- [Changelog](https://github.com/pydantic/httpx2/blob/main/src/httpx2/CHANGELOG.md)
- [Commits](pydantic/httpx2@v2.10.0...v2.12.0)

---
updated-dependencies:
- dependency-name: datamodel-code-generator
  dependency-version: 0.64.0
  dependency-type: direct:development
  dependency-group: python-security
- dependency-name: httpx2
  dependency-version: 2.12.0
  dependency-type: direct:production
  dependency-group: python-security
...

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

Author: dependabot[bot]

pyproject.toml

@@ -113,7 +113,7 @@ docs = [
 # of the default groups so no other environment installs the client (or the
 # legacy httpx it depends on). See i18n/README.md.
 translate = ["anthropic>=0.121.0"]
-codegen = ["datamodel-code-generator==0.57.0"]
+codegen = ["datamodel-code-generator==0.81.0"]
 
 [build-system]
 requires = ["hatchling", "uv-dynamic-versioning"]