Remove support for Python 3.8

[hagenw]

Removes support for Python 3.8 and updates syntax of code to stop using typing.

Summary by Sourcery

Remove support for Python 3.8.

Build:

• Remove Python 3.8 from the CI build matrix.

Chores:

• Update the required Python version to 3.9 in pyproject.toml.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request removes support for Python 3.8 and updates the code to use the new typing syntax introduced in Python 3.9. This includes replacing instances of typing.Union with the pipe operator (|) and updating type annotations accordingly.

Class diagram showing updated type annotations in core modules

classDiagram
    class io {
        +convert_to_wav(infile: str, outfile: str, offset: float|int|str|np.timedelta64, duration: float|int|str|np.timedelta64, bit_depth: int, normalize: bool, overwrite: bool) void
        +read(file: str, duration: float|int|str|np.timedelta64, offset: float|int|str|np.timedelta64, always_2d: bool, dtype: str) tuple[np.array, int]
    }
    class utils {
        +duration_in_seconds(duration: float|int|str|np.timedelta64, sampling_rate: float|int) np.floating
    }
    class info {
        +bit_depth(file: str) int|None
    }
    note for io "Updated type hints to use | operator"
    note for utils "Updated type hints to use | operator"
    note for info "Updated Optional to use | None syntax"

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File-Level Changes

Change	Details	Files
Removed support for Python 3.8.	Removed Python 3.8 from the test matrix. Removed Python 3.8 from the list of supported Python versions. Updated requires-python to >=3.9.	.github/workflows/test.yml pyproject.toml
Updated type annotations to use the new union operator.	Replaced typing.Union with the pipe operator (`	) for type annotations.</li><li>Updated return type annotations to use the new tuple syntax introduced in Python 3.9 (e.g., tuple[np.array, int]instead oftyping.Tuple[np.array, int]`).

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[sourcery-ai]

Hey @hagenw - I've reviewed your changes - here's some feedback:

Overall Comments:

• The PR description mentions removing typing but the typing imports are still present in the files. Consider either updating the description or removing the unused imports.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.0%. Comparing base (c1c1291) to head (9ab6473).
Report is 2 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
audiofile/core/info.py	100.0% <100.0%> (ø)
audiofile/core/io.py	100.0% <100.0%> (ø)
audiofile/core/utils.py	100.0% <100.0%> (ø)