chore(deps): bump chrono from 0.4.42 to 0.4.44 in /backend (#183)

Bumps [chrono](https://github.com/chronotope/chrono) from 0.4.42 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@v0.4.42...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

backend/Cargo.lock

@@ -6,7 +6,7 @@
 [dependencies]
   axum = { version = "0.8" }
   bitcoin = { version = "0.32.8", features = [ "serde" ] }
-  chrono = { version = "0.4.38", features = ["serde"] }
+  chrono = { version = "0.4.44", features = ["serde"] }
   clap = { version = "4.5", features = [ "derive" ] }
   hex = { version = "0.4" }
   jsonrpsee = { version = "0.24", features = [ "http-client" ] }