Prepare version 0.12.0

[sylvestre]

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[Copilot]

🟡 Changes recommended

Add regression coverage for the updater and clarify its header description.

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Pull request overview

Prepares the repository for the 0.12.0 release while making version updates safer for third-party dependencies.

Changes:

• Updates workspace, crate, dependency, and lockfile versions.
• Narrows version-update automation to in-tree dependencies.
• Adds checks for remaining old versions.

File summaries

File	Description
util/update-version.sh	Refines release automation. Moderate: add regression coverage; nit: update the header description.
src/uu/stdbuf/Cargo.toml	Updates the libstdbuf dependency version.
fuzz/uufuzz/Cargo.toml	Updates fuzz crate versions.
fuzz/Cargo.lock	Refreshes fuzz workspace versions.
Cargo.toml	Updates workspace and crate versions.
Cargo.lock	Refreshes workspace package versions.

Review details

Suppressed comments (1)

util/update-version.sh:29

• The header at lines 4–5 still says this helper mass-replaces all versions, but this change intentionally preserves third-party versions. Update that description so release maintainers are not misled about what the script rewrites.

# Only two kinds of lines are rewritten, so that third party crates which
# happen to share our version number (md-5, sha1, sha2, sha3, ...) are left
# alone:
#  1) the crate's own version declaration, anchored at the start of the line
#  2) dependencies carrying a "path =" key, which are the in-tree uutils crates

• Files reviewed: 4/6 changed files
• Comments generated: 1
• Review effort level: Lite

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[github-actions]

GNU testsuite comparison:

Congrats! The gnu test tests/seq/seq-epipe is now passing!