Update nom requirement from 6.1 to 7.1

Updates the requirements on [nom](https://github.com/Geal/nom) to permit the latest version.
- [Changelog](https://github.com/rust-bakery/nom/blob/7.1.3/CHANGELOG.md)
- [Commits](rust-bakery/nom@6.1.0...7.1.3)

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

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

orientdb-client/Cargo.toml

@@ -27,7 +27,7 @@ maintenance = {status = "actively-developed"}
 chrono = "0.4.7"
 byteorder = "1.3.2"
 r2d2 = "0.8.5"
-nom = "6.1"
+nom = "7.1"
 thiserror = "1.0.13"
 async-std =  { version = "1.9", optional = true, features = ["unstable","attributes"] }
 async-trait = { version = "0.1.10", optional = true }