chore(deps): bump tokio-cron-scheduler from 0.13.0 to 0.15.0

Bumps [tokio-cron-scheduler](https://github.com/mvniekerk/tokio-cron-scheduler) from 0.13.0 to 0.15.0.
- [Release notes](https://github.com/mvniekerk/tokio-cron-scheduler/releases)
- [Commits](mvniekerk/tokio-cron-scheduler@v0.13.0...v0.15.0)

---
updated-dependencies:
- dependency-name: tokio-cron-scheduler
  dependency-version: 0.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -68,7 +68,7 @@ stellar-xdr = "23.0.0"
 sysinfo = "0.34.2"
 thiserror = "2.0.12"
 tokio = { version = "1.0", features = ["full"] }
-tokio-cron-scheduler = "0.13.0"
+tokio-cron-scheduler = "0.15.1"
 tokio-tungstenite = "0.26.2"
 tracing = "0.1.41"
 tracing-appender = "0.2"