fix: add frozendict dependency for Python 3.13 compatibility

- Add frozendict ^2.4.0 to Poetry dependencies in pyproject.toml
- Add frozendict to requirements.txt for pip installations
- Resolves Python 3.13 compatibility issues with immutable dict types

Author: Brett Chaldecott

pyproject.toml

@@ -16,6 +16,7 @@ urllib3 = ">= 2.1.0, < 3.0.0"
 python-dateutil = ">= 2.8.2"
 pydantic = ">= 2"
 typing-extensions = ">= 4.7.1"
+frozendict = "^2.4.0"
 
 [tool.poetry.dev-dependencies]
 pytest = ">= 7.2.1"

requirements.txt

@@ -2,3 +2,4 @@ urllib3 >= 2.1.0, < 3.0.0
 python_dateutil >= 2.8.2
 pydantic >= 2
 typing-extensions >= 4.7.1
+frozendict