chore(deps): bump rand from 0.8.5 to 0.9.2 in /stellar-lend

Bumps [rand](https://github.com/rust-random/rand) from 0.8.5 to 0.9.2.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](rust-random/rand@0.8.5...rand_core-0.9.2)

---
updated-dependencies:
- dependency-name: rand
  dependency-version: 0.9.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

stellar-lend/Cargo.lock

@@ -13,4 +13,4 @@ soroban-sdk = { workspace = true, features = ["testutils"] }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
 chrono = { workspace = true, features = ["serde"] }
-rand = "0.8"
+rand = "0.9"