Bump syn from 2.0.90 to 2.0.91 in /src/_bcrypt (#940) #1496

Job	Run time
py312 on alpine	1m 5s
Python 3.8 on macos-13	1m 4s
py312 on alpine:aarch64	1m 28s
Python 3.8 on win32	3m 50s
Python 3.8 on macos-latest	1m 6s
py312 on ubuntu-rolling:aarch64	1m 17s
Python 3.13 on win32	5m 14s
pep8,packaging on linux, Rust stable	1m 17s
Python 3.13 on macos-13	1m 21s
Python 3.8 on win64	1m 32s
mypy on linux, Rust stable	54s
Python 3.13 on macos-latest	38s
Python 3.13 on win64	2m 17s
py38 on linux, Rust stable	37s
py39 on linux, Rust stable	1m 33s
py310 on linux, Rust stable	40s
py311 on linux, Rust stable	1m 20s
py312 on linux, Rust stable	37s
py313 on linux, Rust stable	1m 24s
pypy3 on linux, Rust stable	52s
pypy3 on linux, Rust stable	1m 14s
py313 on linux, Rust 1.64.0	2m 1s
py313 on linux, Rust beta	56s
py313 on linux, Rust nightly	1m 0s
all-green	1s
	35m 18s

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