Bump base64 from 0.21.3 to 0.21.4 in /src/_bcrypt #884

Job	Run time
Python 3.7 on macOS	1m 17s
Python 3.11 on macOS	2m 31s
Python 3.7 on win32	5m 38s
Python 3.11 on win32	3m 40s
Python 3.7 on win64	4m 9s
Python 3.11 on win64	3m 34s
py311 on alpine	1m 18s
pep8,packaging on linux, Rust stable	2m 12s
mypy on linux, Rust stable	1m 1s
py37 on linux, Rust stable	1m 41s
py38 on linux, Rust stable	59s
py39 on linux, Rust stable	1m 2s
py310 on linux, Rust stable	1m 8s
py311 on linux, Rust stable	1m 7s
py312 on linux, Rust stable	1m 38s
pypy3 on linux, Rust stable	1m 25s
pypy3 on linux, Rust stable	1m 35s
py311 on linux, Rust 1.60.0	3m 32s
py311 on linux, Rust beta	1m 23s
py311 on linux, Rust nightly	1m 5s
all-green	2s
	41m 57s

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