Update openai requirement from <1.56,>=1.55 to >=1.55,<1.57

Updates the requirements on [openai](https://github.com/openai/openai-python) to permit the latest version.
- [Release notes](https://github.com/openai/openai-python/releases)
- [Changelog](https://github.com/openai/openai-python/blob/main/CHANGELOG.md)
- [Commits](openai/openai-python@v1.55.0...v1.56.0)

---
updated-dependencies:
- dependency-name: openai
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -62,7 +62,7 @@ test = [
     "Jinja2~=3.1.2",
     "jsonschema~=4.23.0",
     "lxml>=5.3.0,<6.0.0",
-    "openai>=1.55,<1.56",
+    "openai>=1.55,<1.57",
     "mock==5.1.*",
     "pre-commit<5",
     "Pyjwt~=2.10.0",
@@ -86,7 +86,7 @@ complexity = [
     "xenon==0.9.*",
 ]
 openai = [
-    "openai>=1.55,<1.56",
+    "openai>=1.55,<1.57",
 ]
 azure = [
     "azure-ai-inference>=1.0.0b1,<2.0",