Minor stylistic refactoring in proxy test

Minor stylistic refactoring in proxy test

Minor stylistic refactoring in proxy test

Use ephemeral port in proxy tests

source_dir is always set when building a wheel or for editables

Simplify _should_build

Merge pull request pypa#13065 from sirosen/dependency-groups

lock: add --output-file

Merge pull request pypa#13215 from ichard26/pre-commit-ci-update-config

Merge pull request pypa#13214 from sbidoul/release/25.0.1

Merge branch 'main' into release/25.0.1

lock: add --output-file

lock: add --output-file

lock: add --output-file

lock: use relativate paths for directories

lock: use relativate paths for directories

Merge pull request pypa#13193 from notatallshaw/black-25.1.0

lock: use relativate paths for directories

lock: use relativate paths for directories

lock: use relativate paths for directories

lock: use relativate paths for directories

lock: use relativate paths for directories

[WIP] PEP 751: pip lock command

[WIP] PEP 751: pip lock command

[WIP] add pip lock command

[WIP] add pip lock command

[WIP] add pip lock command