chore(deps): update zstd-safe requirement from 6 to 7

[dependabot[bot]]

Updates the requirements on zstd-safe to permit the latest version.

Release notes

Sourced from zstd-safe's releases.

zstd-safe v7.0.0

• OutBuffer::dst is no longer public.
• Added OutBuffer::as_mut_ptr and OutBuffer::capacity.
• Replaced libc with core::ffi for type aliases.

Commits

• 6ae83b9 Bump zstd-safe to 7.0.0
• fa3e7e5 Bump zstd-sys to 2.0.9
• ba0e851 Improve doc for stream::raw::Status::remaining
• bd13b98 Improve doc
• 47107c3 Cleanup readme
• e52aa16 Add wasm badge
• 0f6268d Fix windows CI
• 1055357 Do not implement clock on wasm32, just return 0
• e1c631c Bump windows CI toolchain action
• 8bce1c4 Add wasm32 CI
• Additional commits viewable in compare view

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[robjtede]

I updated zstd as well to get compiles working again.