upgrade to libsodium 1.0.20-stable (#823) #469

Job	Run time
Python 3.6 on macos-13	3m 5s
Python 3.6 on Windows x86	3m 12s
Python 3.12 on macos-13	3m 2s
Linux docs	1m 5s
Python 3.7 on Windows x86	3m 17s
Python 3.12 (minimal build) on macos-13	3m 38s
Linux meta	1m 17s
Python 3.8 on Windows x86	2m 6s
Python 3.12 on macos-latest	3m 23s
Linux mypy	59s
Python 3.9 on Windows x86	2m 53s
Python 3.12 (minimal build) on macos-latest	1m 37s
Linux pypy3	3m 38s
Python 3.10 on Windows x86	3m 40s
Linux pypy3	3m 39s
Python 3.11 on Windows x86	2m 54s
Linux py36	1m 48s
Linux py37	1m 43s
Python 3.12 on Windows x86	3m 10s
Linux py38	1m 39s
Python 3.6 on Windows x64	2m 11s
Linux py39	1m 37s
Python 3.7 on Windows x64	2m 18s
Linux py310	1m 46s
Python 3.8 on Windows x64	1m 49s
Python 3.9 on Windows x64	1m 58s
Linux py311	1m 38s
Python 3.10 on Windows x64	1m 47s
Linux py312	1m 56s
Python 3.11 on Windows x64	3m 15s
Linux py312 system	3m 12s
Linux py312 minimal	1m 50s
Python 3.12 on Windows x64	3m 34s
	1h 20m 36s

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