Bump syn from 2.0.89 to 2.0.90 in /src/_bcrypt #1474

Job	Run time
Python 3.8 on win32	2m 51s
py312 on alpine	1m 5s
Python 3.13 on win32	3m 37s
pep8,packaging on linux, Rust stable	1m 25s
py312 on alpine:aarch64	1m 6s
Python 3.8 on win64	3m 22s
mypy on linux, Rust stable	1m 2s
py312 on ubuntu-rolling:aarch64	45s
Python 3.13 on win64	3m 23s
py38 on linux, Rust stable	53s
py39 on linux, Rust stable	1m 13s
Python 3.8 on macos-13	1m 9s
py310 on linux, Rust stable	47s
Python 3.8 on macos-latest	1m 21s
py311 on linux, Rust stable	40s
Python 3.13 on macos-13	1m 10s
py312 on linux, Rust stable	57s
Python 3.13 on macos-latest	46s
py313 on linux, Rust stable	1m 3s
pypy3 on linux, Rust stable	1m 0s
pypy3 on linux, Rust stable	1m 13s
py313 on linux, Rust 1.64.0	1m 26s
py313 on linux, Rust beta	1m 25s
py313 on linux, Rust nightly	1m 6s
all-green	1s
	34m 46s

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