build(deps): bump chrono from 0.4.43 to 0.4.44 in /backend

Bumps [chrono](https://github.com/chronotope/chrono) from 0.4.43 to 0.4.44.
- [Release notes](https://github.com/chronotope/chrono/releases)
- [Changelog](https://github.com/chronotope/chrono/blob/main/CHANGELOG.md)
- [Commits](chronotope/chrono@v0.4.43...v0.4.44)

---
updated-dependencies:
- dependency-name: chrono
  dependency-version: 0.4.44
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

backend/Cargo.lock

@@ -12,7 +12,7 @@ rust-version = "1.85.0"
 
 [dependencies]
 axum = { version = "0.8.8", features = ["http2", "macros"] }
-chrono = "0.4.43"
+chrono = "0.4.44"
 clap = { version = "4.5.60", features = ["derive"] }
 color-eyre = "0.6.5"
 dotenvy = "0.15.7"