[gijzelaerr]

Bump version to 3.4.0 in pyproject.toml, refresh uv.lock, and rename Unreleased to 3.4.0 in CHANGES.md.

Minor release: #973 adds public API (snap7.tags.decode_tag / encode_tag). The rest are bug fixes:

• Reject an invalid millisecond digit in clock data #966: invalid clock millisecond digits
• Check the PDU reference of USER_DATA follow-up replies #967: PDU reference check on USER_DATA follow-up replies
• Refuse characters above U+FFFF in set_wchar #968: set_wchar above U+FFFF
• Refuse tags with no known size in strict parse_tag #974: strict parse_tag for types with no known size
• Refuse a short buffer in every setter #975: setters refuse a short buffer
• Address the peer's COTP reference in the disconnect request #979: COTP disconnect request reference, CP 343-1; not yet confirmed on the CP

Behaviour changes to note:

• Setters that silently grew a short bytearray now raise ValueError (Refuse a short buffer in every setter #975).
• parse_tag with strict=True, the default, rejects size-less types (Refuse tags with no known size in strict parse_tag #974).

Both are in the changelog.

After merging: tag 3.4.0 on master and run the "Publish distribution to PyPI" workflow.

This release unblocks gijzelaerr/ha-s7#56 (stop importing private helpers) and gijzelaerr/lean-s7#67 (adapter corrections).

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