fix(deps): update rust crate pubgrub to 0.4.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pubgrub	dependencies	minor	0.3.0 → 0.4.0

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Release Notes

pubgrub-rs/pubgrub (pubgrub)

v0.4.0

Compare Source

Breaking

• DependencyConstraints is now an opaque type that retains the ordering of the dependencies across platforms. This
  fixes unstable resolutions across platform (#​373). DependencyConstraints
  can be constructed from an iterator. It is currently backed by a Vec internally.
• Following the above, SelectedDependencies is now an opaque type that support iteration and get().

Added

• Add method for incompatibilities between virtual and base packages (#​352)

Changed

• Print version set on panic (#​337)
• Declare a minimum supported Rust version of 1.92 (#​197)
• Update to the 2024 edition (#​348)

Fixed

• Allow multiple self-dependencies (#​338)

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