uv: update to 0.9.7

[trustbyte]

Description

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 26.0.1 25A362 arm64
Command Line Tools 26.0.0.0.1.1757719676

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL in commit message?
• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

Security fix included:
Upgrade astral-tokio-tar to 0.5.6 to address a parsing differential (astral-sh/uv#16387)

[macportsbot]

Notifying maintainers:
@TheRealKeto for port uv.