chore: release v9.0.0-pre3.1

[Pr0methean]

🤖 New release

• zip: 9.0.0-pre3 -> 9.0.0-pre3.1 (✓ API compatible changes)

Changelog

9.0.0-pre3.1 - 2026-08-18

🚀 Features

• add test to in place modification (#945)
• move CustomExtraField to own file (#941)
• add a test on enum size (#939)
• use ZipFileEntry instead of ZipStreamFileMetadata (#935)
• add ZipFileEntry with no Reader (#933)
• change aes_mode to aes_settings() in ZipFileData (#925)
• cleanup and harmonize extra fields (#923)
• Rewrite zip64 extra (#913)

🐛 Bug Fixes

• remove extra alloc used to copy (#938)
• lazy allocation on error case (#937)
• fix data alignement (#929)

🚜 Refactor

• create ZipFileFlags to wrap flags (#947)
• remove unused trait (#946)
• access crate::format with zip::unstable::format (#944)
• harmonize functions to format/functions.rs (#943)
• rewrite make_reader() function (#936)
• simplify initialize_local_block (#934)
• move write options to write/options.rs (#931)
• move spec to format (#932)
• move Magic to format (#930)
• [breaking] Remove ZipFileData::extra_data_start field that is never read (#926)

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This PR was generated with release-plz.

[amazon-q-developer]

Review Summary

This PR updates the version from 9.0.0-pre3 to 9.0.0-pre3.1 and adds corresponding changelog entries.

Critical Issue Found

There is a logic error in the release date that must be corrected before merge. The changelog entry specifies "2026-08-16" which is a future date and appears to be a typo introduced by the automated release tool (release-plz). This should be corrected to "2025-08-16" to accurately reflect the actual release date.

The version bump in Cargo.toml is correct and consistent with the changelog.

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