build: bump jiff from 0.2.28 to 0.2.31

[dependabot]

Bumps jiff from 0.2.28 to 0.2.31.

Changelog

Sourced from jiff's changelog.

0.2.31 (2026-06-29)

This release fixes a minor bug in tests that prevents the crate from running through standard build processes in Linux distributions downstream.

• #594: Fix imports in recently added tests.

0.2.30 (2026-06-29)

This release fixes a safety soundness bug in Jiff's lower level printing APIs. There is also a nice performance improvement to civil::Date::weekday, which also improves downstread routines like civil::Date::nth_weekday and datetime<-->timestamp conversions in some cases.

Enhancements:

• #591: Improve the performance of weekday calculations from Gregorian dates by 30-50%.

Bug fixes:

• #592: Fix safety soundness bug when using a non-empty String destination buffer with lower level printing APIs inside of jiff::fmt.

0.2.29 (2026-06-20)

This release adds support for [defmt], which is a highly efficient logging framework that targets resource-constrained devices, like microcontrollers.

Enhancements:

• #505: Add support for the defmt crate by implementing defmt::Format on the principle public types in Jiff.
• #584: Add Zoned::UNIX_EPOCH as a constant.
• #587: Change the Debug output for civil::ISOWeekDate to match the Debug output style of other primitive datetime types.

Bug fixes:

• #525: Fix a bug that prevented time zone lookups when using an on-disk time zone database on Windows.
• #539:

... (truncated)

Commits

• 8fb795f 0.2.31
• 528207f changelog: 0.2.31
• 91ee475 test: use crate::… instead of jiff::… in a couple of lib tests
• 4c3a86e 0.2.30
• 5cb4c43 changelog: 0.2.30
• 9e8f1fc fmt: add missing SAFETY comment
• 90823a4 tz: beef up the safety comment in the emscripten call
• fadac1c tz: drop use of dlerror
• 62db326 fmt: fix soundness bug
• df6885d civil: fast weekday calculation
• Additional commits viewable in compare view

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