Bump base64 from 0.21.3 to 0.21.4 in /src/_bcrypt (#633) #885

Job	Run time
Python 3.7 on win32	5m 17s
Python 3.11 on win32	6m 13s
Python 3.7 on win64	3m 39s
Python 3.11 on win64	4m 16s
py311 on alpine	1m 20s
Python 3.7 on macOS	1m 17s
Python 3.11 on macOS	3m 10s
pep8,packaging on linux, Rust stable	1m 34s
mypy on linux, Rust stable	1m 7s
py37 on linux, Rust stable	1m 3s
py38 on linux, Rust stable	1m 2s
py39 on linux, Rust stable	1m 1s
py310 on linux, Rust stable	1m 38s
py311 on linux, Rust stable	1m 10s
py312 on linux, Rust stable	1m 12s
pypy3 on linux, Rust stable	1m 46s
pypy3 on linux, Rust stable	2m 4s
py311 on linux, Rust 1.60.0	3m 35s
py311 on linux, Rust beta	1m 5s
py311 on linux, Rust nightly	54s
all-green	4s
	44m 27s

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