poetry: update datamodel-code-generator requirement

Updates the requirements on [datamodel-code-generator](https://github.com/koxudaxi/datamodel-code-generator) to permit the latest version.
- [Release notes](https://github.com/koxudaxi/datamodel-code-generator/releases)
- [Commits](koxudaxi/datamodel-code-generator@0.26.0...0.28.1)

---
updated-dependencies:
- dependency-name: datamodel-code-generator
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pyproject.toml

@@ -41,7 +41,7 @@ hypothesis = "^6.87.3"
 aws-lambda-powertools = { extras = ["aws-sdk"], version = "^2.26.0" }
 parse = "^1.19.1"
 pytest-mock = "^3.12.0"
-datamodel-code-generator = "^0.26.0"
+datamodel-code-generator = "^0.28.1"
 pyyaml = "^6.0.1"
 proxygen-cli = "^2.1.14"
 moto = "^5.0.1"