Update sqllogictest requirement from 0.15.0 to 0.18.0

Updates the requirements on [sqllogictest](https://github.com/risinglightdb/sqllogictest-rs) to permit the latest version.
- [Release notes](https://github.com/risinglightdb/sqllogictest-rs/releases)
- [Changelog](https://github.com/risinglightdb/sqllogictest-rs/blob/main/CHANGELOG.md)
- [Commits](risinglightdb/sqllogictest-rs@v0.15.0...v0.18.0)

---
updated-dependencies:
- dependency-name: sqllogictest
  dependency-type: direct:production
...

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

datafusion/sqllogictest/Cargo.toml

@@ -41,7 +41,7 @@ itertools = "0.11"
 object_store = "0.7.0"
 rust_decimal = {version = "1.27.0"}
 log = "^0.4"
-sqllogictest = "0.15.0"
+sqllogictest = "0.18.0"
 sqlparser.workspace = true
 tempfile = "3"
 thiserror = "1.0.44"