Update nom requirement from ^7.0 to ^8.0

Updates the requirements on [nom](https://github.com/rust-bakery/nom) to permit the latest version.
- [Changelog](https://github.com/rust-bakery/nom/blob/main/CHANGELOG.md)
- [Commits](rust-bakery/nom@7.0.0...8.0.0)

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

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

Cargo.toml

@@ -13,7 +13,7 @@ categories = ["network-programming", "database"]
 
 [dependencies]
 circular = "^0.3"
-nom = "^7.0"
+nom = "^8.0"
 rpsl = "^0.1"
 strum = {version = "^0.26", features = ["derive"]}
 thiserror = "^1.0"