build(deps): Update rig-core requirement from 0.2.1 to 0.18.2

Updates the requirements on [rig-core](https://github.com/0xPlaygrounds/rig) to permit the latest version.
- [Release notes](https://github.com/0xPlaygrounds/rig/releases)
- [Commits](0xPlaygrounds/rig@rig-core-v0.2.1...rig-core-v0.18.2)

---
updated-dependencies:
- dependency-name: rig-core
  dependency-version: 0.18.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.toml

@@ -39,7 +39,7 @@ async-trait = { version = "0.1", optional = true }
 uuid = { version = "1.0", optional = true }
 futures = { version = "0.3", optional = true }
 tokio = { version = "1.0", features = ["rt-multi-thread", "macros", "sync"], optional = true }
-rig-core = { version = "0.2.1", optional = true }
+rig-core = { version = "0.18.2", optional = true }
 pyo3 = { version = "0.22", features = ["extension-module"], optional = true }
 rocksdb = { version = "0.22", optional = true }
 ratatui = { version = "0.26", optional = true }