chore(contracts)(deps): bump rand from 0.8.7 to 0.9.5 in /contracts (#1226)

Bumps [rand](https://github.com/rust-random/rand) from 0.8.7 to 0.9.5.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/0.9.5/CHANGELOG.md)
- [Commits](rust-random/rand@0.8.7...0.9.5)

---
updated-dependencies:
- dependency-name: rand
  dependency-version: 0.9.5
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

contracts/Cargo.lock

@@ -67,6 +67,6 @@ panic = "abort"
 codegen-units = 1
 lto = true
 soroban-sdk = { version = "26.1.0", features = ["testutils"] }
-rand = { version = "0.8", features = ["small_rng"] }
+rand = { version = "0.9", features = ["small_rng"] }
 ed25519-dalek = { version = "2", default-features = false, features = ["std", "rand_core"] }
 proptest = "1"

contracts/Cargo.toml

@@ -11,4 +11,4 @@ soroban-sdk = "26.1.0"
 
 [dev-dependencies]
 soroban-sdk = { version = "26.1.0", features = ["testutils"] }
-rand = { version = "0.8", features = ["small_rng"] }
+rand = { version = "0.9", features = ["small_rng"] }