Update nom requirement from 7 to 8

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>

askama_parser/Cargo.toml

@@ -14,7 +14,7 @@ edition = "2021"
 rust-version = "1.65"
 
 [dependencies]
-nom = { version = "7", default-features = false, features = ["alloc"] }
+nom = { version = "8", default-features = false, features = ["alloc"] }
 
 [dev-dependencies]
 criterion = "0.5"