fix(deps)(deps): update soroban-sdk requirement in /contracts

Updates the requirements on [soroban-sdk](https://github.com/stellar/rs-soroban-sdk) to permit the latest version.
- [Release notes](https://github.com/stellar/rs-soroban-sdk/releases)
- [Commits](stellar/rs-soroban-sdk@v21.7.7...v27.0.3)

---
updated-dependencies:
- dependency-name: soroban-sdk
  dependency-version: 27.0.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

contracts/Cargo.toml

@@ -27,5 +27,5 @@ codegen-units = 1
 lto = true
 
 [workspace.dependencies]
-soroban-sdk = "21.7.7"
+soroban-sdk = "27.0.3"
 arbitrary = { version = "1.3", features = ["derive"] }

contracts/subscription/Cargo.toml

@@ -13,10 +13,10 @@ crate-type = ["cdylib", "rlib"]
 serde = "1.0"
 
 [dependencies]
-soroban-sdk = "21.0.0"
+soroban-sdk = "27.0.3"
 subtrackr-types = { path = "../types" }
 
 [dev-dependencies]
-soroban-sdk = { version = "21.0.0", features = ["testutils"] }
+soroban-sdk = { version = "27.0.3", features = ["testutils"] }
 subtrackr-proxy = { path = "../proxy" }
 subtrackr-storage = { path = "../storage" }

contracts/types/Cargo.toml

@@ -11,4 +11,4 @@ path = "src/lib.rs"
 crate-type = ["rlib"]
 
 [dependencies]
-soroban-sdk = "21.7.7"
+soroban-sdk = "27.0.3"