chore(deps)(deps): update bcrypt requirement from >=4.0.0 to >=5.0.0 in /backend

[dependabot]

Updates the requirements on bcrypt to permit the latest version.

Changelog

Sourced from bcrypt's changelog.

5.0.0

• Bumped MSRV to 1.74.
• Added support for Python 3.14 and free-threaded Python 3.14.
• Added support for Windows on ARM.
• Passing hashpw a password longer than 72 bytes now raises a ValueError. Previously the password was silently truncated, following the behavior of the original OpenBSD bcrypt implementation.

4.3.0

• Dropped support for Python 3.7.
• We now support free-threaded Python 3.13.
• We now support PyPy 3.11.
• We now publish wheels for free-threaded Python 3.13, for PyPy 3.11 on manylinux, and for ARMv7l on manylinux.

4.2.1

• Bump Rust dependency versions - this should resolve crashes on Python 3.13 free-threaded builds.
• We no longer build manylinux wheels for PyPy 3.9.

4.2.0

• Bump Rust dependency versions
• Removed the BCRYPT_ALLOW_RUST_163 environment variable.

4.1.3

• Bump Rust dependency versions

4.1.2

• Publish both py37 and py39 wheels. This should resolve some errors relating to initializing a module multiple times per process.

4.1.1

• Fixed the type signature on the kdf method.
• Fixed packaging bug on Windows.
• Fixed incompatibility with passlib package detection assumptions.

... (truncated)

Commits

• 5060bce 5.0.0 release (#1078)
• e43f568 Bump actions/cache from 4.2.4 to 4.3.0 (#1077)
• fc9f680 Bump libc from 0.2.175 to 0.2.176 in /src/_bcrypt (#1075)
• 633f46f Add support for Python 3.14 (#1073)
• a2fefbb Remove pypy310 builds (#1074)
• f60707e Bump wasi from 0.14.5+wasi-0.2.4 to 0.14.7+wasi-0.2.4 in /src/_bcrypt (#1071)
• c790eed Bump unicode-ident from 1.0.18 to 1.0.19 in /src/_bcrypt (#1070)
• 122cbdc Bump target-lexicon from 0.13.2 to 0.13.3 in /src/_bcrypt (#1069)
• 2bd208d Bump wasi from 0.14.4+wasi-0.2.4 to 0.14.5+wasi-0.2.4 in /src/_bcrypt (#1068)
• e1aa9e8 remove poinless cargo cache paths from CI (#1067)
• Additional commits viewable in compare view

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[bahamutww]

Superseded by #327, which raises the security floors for all 9 backend dependencies (including this one) in a single change. Closing; once #327 merges into main the new floor is enforced repo-wide. / 已由 #327 统一提升安全下界（含本 PR 目标版本），先行关闭。

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