Use 3.13 by default in dev #209

# to view logs

Job	Run time
Build & verify package	42s
Verify dev env (ubuntu-latest)	26s
Ensure cogified files are up-to-date	12s
Verify dev env (windows-latest)	1m 48s
Install and test with system package of Argon2	29s
Verify dev env (macos-latest)	37s
Tests on 3.9	28s
Tests on 3.10	22s
Tests on 3.11	18s
Tests on 3.12	22s
Tests on 3.13	34s
Tests on pypy-3.9	41s
Tests on pypy-3.10	35s
Ensure everything required is passing for branch protection	6s
	7m 40s

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