upgrade to libsodium 1.0.20-stable #467

Job	Run time
Linux docs	1m 7s
Python 3.6 on macos-13	3m 43s
Linux meta	55s
Python 3.6 on Windows x86	15s
Python 3.12 on macos-13	3m 31s
Linux mypy	56s
Python 3.7 on Windows x86	13s
Python 3.12 (minimal build) on macos-13	3m 42s
Linux pypy3	1m 11s
Python 3.8 on Windows x86	13s
Python 3.12 on macos-latest	1m 47s
Linux pypy3	1m 10s
Python 3.9 on Windows x86	12s
Python 3.12 (minimal build) on macos-latest	1m 29s
Python 3.10 on Windows x86	11s
Linux py36	1m 11s
Python 3.11 on Windows x86	13s
Linux py37	1m 10s
Python 3.12 on Windows x86	13s
Linux py38	1m 11s
Python 3.6 on Windows x64	17s
Linux py39	1m 11s
Python 3.7 on Windows x64	14s
Linux py310	1m 12s
Python 3.8 on Windows x64	11s
Linux py311	1m 8s
Python 3.9 on Windows x64	10s
Linux py312	1m 11s
Python 3.10 on Windows x64	14s
Linux py312 system	59s
Python 3.11 on Windows x64	15s
Linux py312 minimal	1m 9s
Python 3.12 on Windows x64	14s
	32m 58s

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