Bump flexi_logger from 0.29.8 to 0.31.9

[dependabot]

Bumps flexi_logger from 0.29.8 to 0.31.9.

Changelog

Sourced from flexi_logger's changelog.

[0.31.9] - 2026-05-22

Fix bug #205 in FileSpec::default_basename, and add a test.

Code maintenance: update dependencies, add semver check to qualify.rs, fix new clippy.

[0.31.8] - 2026-01-15

Add option to bind background threads to a specific cpu core. See WriteMode::AsyncPinnedWith.

Bump minimal supported rust version to 1.83.0, due to updated dependencies.

[0.31.7] - 2025-10-08

Provide the hostname also for syslog messages of type RFC 3164 (see PR #201). Kudos goes to julienjpk-withings.

[0.31.6] - 2025-10-08

Make sure that tracing does not get confused with blanks that are normally printed into LogSpecification's Display String (issue #200), by providing a dedicated method. Kudos goes to samantehrani.

[0.31.5] - 2025-10-06

Fix [issue #198](emabee/flexi_logger#198). Kudos goes to hasezoey.

[0.31.4] - 2025-09-23

Add variant Cleanup::KeepForDays(usize) to have log files being deleted after a given number of days. Kudos goes to Tunglies.

[0.31.3] - 2025-09-22

Yanked.

[0.31.2] - 2025-06-27

Add syslog-call based SyslogWriter connection (kudos to AlexTMjugador).

[0.31.1] - 2025-06-22

Improve input qualification in FileSpec::try_from (fixes #194).

[0.31.0] - 2025-06-16

... (truncated)

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