Update uom requirement from 0.37.0 to 0.38.0

[dependabot]

Updates the requirements on uom to permit the latest version.

Changelog

Sourced from uom's changelog.

[v0.38.0] — 2026-02-13

This release adds new quantities, new units, compile time improvements, resolves regressions introduced in v0.37.0, and bumps the MSRV (minimum supported Rust version) to 1.68.0.

The release contains a breaking change to remove unnecessary unit struct fields from Units enum variants. Affected code can be updated by removing the unit struct when using the enum.

- assert_eq!("km", length::Units::kilometer(kilometer).abbreviation());
+ assert_eq!("km", length::Units::kilometer.abbreviation());

The next release of uom will remove the long deprecated use_serde feature. The serde feature should be used in it's place.

Many thanks to elongatedsquid, gdtroszak, Jonahbell, jschillem, nnethercote, portyanikhin, TheComamba, and Turbo87 for pull requests included and issues resolved in this release.

Added

• #506 Add CompressibilityCoefficient quantity.
• #512 Add Illuminance quantity.
• #524 Add ancient Roman units of Length, Area, Volume, and Mass.
• #526 Add watt_hour_per_square_meter unit to RadiantExposure.
• #549 Add data_mile unit to Length.

Changed

• #544 Increase MSRV (minimum supported Rust version) to 1.68.0. Newer versions of serde_json require the update.
• #553 Use serde_core instead of serde.
• #552 [Breaking] Remove unnecessary unit struct fields from Units enum variants. The unit struct fields were never used beyond construction.
• #563 Correct astronomical_unit precision.

Fixed

• #521 Fix unit! macro to be able to be used in foreign crates when running tests. Correct CI tests to run for all targets to detect future regressions.
• #533, #536, #537 Improve compile time. v0.38.0 compiles 15 % +/- 1 % faster than v0.37.0 even after the numerous quantity and unit additions. Most improvements involving simplifying macro patterns or call trees.
• #531, #532, #534,

... (truncated)

Commits

• 5cef189 Release v0.38.0.
• 8e4689e Correct astronomical_unit precision.
• 8c0c03e Merge pull request #521 from Johnabell/fix-unit-tests-foreign-crates-unit-macro
• 701c35a fix: enable using unit macro in foreign crate under test
• 494150d Correct CI tests to run for all targets.
• 0faac65 Consistently use implicit and explicit returns.
• 2cf2bab Use Rust 1.93.0 for tool checks (rustfmt, clippy, tarpaulin).
• 6ab9be2 Update Cargo.lock dependencies.
• 5af6803 Merge pull request #552 from Turbo87/remove-units-enum-fields
• 049b05d Remove unnecessary unit struct fields from Units enum variants
• Additional commits viewable in compare view

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