release: bump version to 2.3.4

[radoering]

Fixed

• Fix a performance regression in the wheel installer that was introduced in Poetry 2.3.3 (#10821).
• Fix a path traversal vulnerability in sdist extraction on Python 3.10.0-3.10.12 and 3.11.0-3.11.4 that could allow malicious tarball files to write files outside the target directory (#10837).

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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