update to Python 3.13

[YeChen-IDM]

should we bump a minor version?

[Copilot]

Pull request overview

This PR updates the codebase to support Python 3.13 by adopting modern Python type hint syntax and string formatting conventions.

Changes:

• Replaced legacy typing module imports with built-in type hints (e.g., List[int] → list[int], Union[str, int] → str | int)
• Converted old-style string formatting (.format() and % operator) to f-strings
• Added Python 3.13 to supported versions in pyproject.toml and updated CI/CD workflows to use Python 3.13

Reviewed changes

Copilot reviewed 26 out of 26 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
pyproject.toml	Added Python version classifiers 3.9-3.14 to declare compatibility
emod_api/weather/weather.py	Modernized type hints by replacing typing module imports with built-in generics
emod_api/spatialreports/spatial.py	Updated type annotations to use native list/dict types
emod_api/serialization/dtkFileUtility.py	Converted format strings to f-strings throughout
emod_api/serialization/dtkFileTools.py	Replaced .format() calls with f-strings in error messages
emod_api/serialization/SerializedPopulation.py	Updated type hints and replaced typing.Union with pipe operator
emod_api/demographics/*.py	Modernized type hints and converted string formatting to f-strings across multiple distribution modules
emod_api/config/*.py	Updated type hints and converted to f-string formatting
emod_api/channelreports/*.py	Replaced typing module imports with native type hints
emod_api/campaign.py	Converted string formatting to f-string
docs/index.md	Added Python 3.13 version documentation
README.md	Added Python version requirement notice
.github/workflows/*.yml	Updated CI/CD workflows to use Python 3.13

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[Copilot]

The validation message still uses positional format placeholders ({0}, {1}, {2}) instead of f-string syntax. While this works with .format(), consider using named placeholders or converting to f-strings for consistency with the rest of the PR changes.

[Copilot]

The validation message uses positional format placeholders ({0}, {1}, {2}) instead of f-string syntax. While this works with .format(), consider using named placeholders or converting to f-strings for consistency with the rest of the PR changes.

[Copilot]

The validation message uses positional format placeholders ({0}, {1}, {2}) instead of f-string syntax. While this works with .format(), consider using named placeholders or converting to f-strings for consistency with the rest of the PR changes.

[Copilot]

The validation message uses positional format placeholders ({0}, {1}, {2}) instead of f-string syntax. While this works with .format(), consider using named placeholders or converting to f-strings for consistency with the rest of the PR changes.