Add 3.13 to CI #204

Job	Run time
Build & verify package	19s
Verify dev env (ubuntu-latest)	22s
Verify dev env (windows-latest)	47s
Verify dev env (macos-latest)	19s
Mypy Codebase	21s
Pyright Codebase	20s
Build docs & run doctests	31s
Install & test with system package of Argon2	31s
Tests & Mypy API on 3.7	26s
Tests & Mypy API on 3.8	23s
Tests & Mypy API on 3.9	29s
Tests & Mypy API on 3.10	30s
Tests & Mypy API on 3.11	25s
Tests & Mypy API on 3.12	37s
Tests & Mypy API on 3.13	30s
Tests & Mypy API on pypy-3.7	41s
Tests & Mypy API on pypy-3.8	32s
Tests & Mypy API on pypy-3.9	33s
Tests & Mypy API on pypy-3.10	37s
Combine & check coverage	0s
Ensure everything required is passing for branch protection	3s
	9m 16s

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