Bump getrandom from 0.2.15 to 0.3.1 in /src/_bcrypt #1548

Job	Run time
Python 3.8 on win32	2m 30s
Python 3.13 on win32	2m 32s
Python 3.8 on macos-13	49s
Python 3.13t on win32	2m 33s
tests on alpine	50s
Python 3.8 on macos-latest	1m 10s
3.13 on linux, Rust stable	34s
Python 3.8 on win64	2m 28s
tests on alpine:aarch64	50s
Python 3.13 on macos-13	55s
3.13 on linux, Rust stable	45s
Python 3.13 on win64	2m 32s
3.8 on linux, Rust stable	37s
Python 3.13t on win64	2m 31s
tests on ubuntu-rolling:aarch64	46s
Python 3.13 on macos-latest	36s
Python 3.13t on macos-13	1m 52s
3.9 on linux, Rust stable	38s
3.10 on linux, Rust stable	31s
Python 3.13t on macos-latest	1m 19s
3.11 on linux, Rust stable	39s
3.12 on linux, Rust stable	35s
3.13 on linux, Rust stable	39s
3.13t on linux, Rust stable	40s
pypy-3.9 on linux, Rust stable	47s
pypy-3.10 on linux, Rust stable	37s
3.13 on linux, Rust 1.64.0	46s
3.13 on linux, Rust beta	38s
3.13 on linux, Rust nightly	38s
all-green	2s
	33m 19s

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