bump version to 0.8.4 #83

Job	Run time
Ruff linting, formating, MyPy	1m 7s
Test with coverage (3.8, ubuntu-latest)	4m 9s
Test with coverage (3.11, ubuntu-latest)	3m 56s
Test with coverage (3.13, ubuntu-latest)	4m 0s
Test with coverage (3.12, ubuntu-latest)	3m 54s
Test with coverage (3.10, ubuntu-latest)	4m 3s
Test with coverage (3.9, ubuntu-latest)	4m 11s
Windows/MacOS unit tests (3.9, macos-latest)	57s
Windows/MacOS unit tests (3.10, windows-latest)	1m 42s
Windows/MacOS unit tests (3.12, windows-latest)	1m 40s
Windows/MacOS unit tests (3.8, windows-latest)	2m 10s
Windows/MacOS unit tests (3.12, macos-latest)	53s
Windows/MacOS unit tests (3.13, macos-latest)	26s
Windows/MacOS unit tests (3.11, macos-latest)	42s
Windows/MacOS unit tests (3.9, windows-latest)	1m 56s
Windows/MacOS unit tests (3.8, macos-latest)	2m 7s
Windows/MacOS unit tests (3.10, macos-latest)	57s
Windows/MacOS unit tests (3.13, windows-latest)	1m 33s
Windows/MacOS unit tests (3.11, windows-latest)	1m 48s
	42m 11s

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