Update charmcraft.yaml build tools (16/edge)

[renovate]

This PR contains the following updates:

Package	Update	Change	Age	Confidence
rust-lang/rust	patch	1.96.0 → 1.96.1
uv (source, changelog)	patch	0.11.25 → 0.11.27

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Release Notes

rust-lang/rust (rust-lang/rust)

v1.96.1

Compare Source

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• Cargo: fix timeout/retry behavior
• Cargo: apply patches for CVE-2025-15661, CVE-2026-55199, and CVE-2026-55200 to libssh2
• rustc: fix miscompilation in MIR optimization

astral-sh/uv (uv)

v0.11.27

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Released on 2026-07-06.

Enhancements

• Continue on ignored errors when fetching wheel metadata (#​12255)
• Use caching for --python-downloads-json-url (#​16749)

Preview features

• Discover extensionless shebang scripts in uv workspace list --scripts (#​20099)

Performance

• Avoid full site-packages scans for direct reinstalls (#​20119)
• Avoid redundant pyproject parsing (#​20076)
• Cache default dependency markers when reading locks (#​20125)
• Enable SIMD-accelerated TOML parsing (#​20079)
• Intern requires-python specifiers in Simple API parsing (#​20104)
• Read cache entries into exact-sized buffers (#​20120)
• Reduce VersionSpecifiers parsing allocations (#​20105)
• Reduce site-packages scan allocation overhead (#​20087)
• Reuse package names when parsing wheel filenames (#​20110)
• Sort Simple API files after grouping (#​20112)

Bug fixes

• Always emit packages table for pylock.toml (#​20145)
• Avoid blank line for empty uv pip tree (#​20062)
• Encode hashes in file paths (#​19807)
• Error on a registry uv.lock package without a version instead of panicking (#​19855)
• Preserve conditional extra markers in exports (#​20148)
• Skip the ambiguous authority check for file transport VCS URLs (#​20086)
• Sync index format when uv add --index updates an existing index URL (#​19818)

Other changes

• Re-add pub APIs used in Pixi (#​20074)
• Update Rust toolchain to 1.96.1 (#​20103)

v0.11.26

Compare Source

Released on 2026-06-30.

Performance

• Adapt uv to IDs-only PubGrub dependencies (#​20048)
• Avoid allocations in ForkMap::contains (#​20023)
• Reuse resolver work across PubGrub iterations (#​20020)
• Speed up candidate selection for disjoint ranges (#​20026)

Bug fixes

• Warn when the build cache is inside the source directory (#​20056)

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