chore: release v0.6.0

[Ravencentric]

🤖 New release

• nzb-rs: 0.5.13 -> 0.6.0 (⚠ API breaking changes)

⚠ nzb-rs breaking changes

--- failure enum_no_repr_variant_discriminant_changed: enum variant had its discriminant change value ---

Description:
The enum's variant had its discriminant value change. This breaks downstream code that used its value via a numeric cast like `as isize`.
        ref: https://doc.rust-lang.org/reference/items/enumerations.html#assigning-discriminant-values
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.43.0/src/lints/enum_no_repr_variant_discriminant_changed.ron

Failed in:
  variant ParseNzbError::FileAttribute 3 -> 4 in /tmp/.tmpXRjgIx/nzb-rs/src/errors.rs:41
  variant ParseNzbError::XmlSyntax 4 -> 5 in /tmp/.tmpXRjgIx/nzb-rs/src/errors.rs:48

--- failure enum_variant_added: enum variant added on exhaustive enum ---

Description:
A publicly-visible enum without #[non_exhaustive] has a new variant.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#enum-variant-new
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.43.0/src/lints/enum_variant_added.ron

Failed in:
  variant ParseNzbError:OnlyPar2Files in /tmp/.tmpXRjgIx/nzb-rs/src/errors.rs:37

--- warning partial_ord_enum_variants_reordered: enum variants reordered in #[derive(PartialOrd)] enum ---

Description:
A public enum that derives PartialOrd had its variants reordered. #[derive(PartialOrd)] uses the enum variant order to set the enum's ordering behavior, so this change may break downstream code that relies on the previous order.
        ref: https://doc.rust-lang.org/std/cmp/trait.PartialOrd.html#derivable
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.43.0/src/lints/partial_ord_enum_variants_reordered.ron

Failed in:
  ParseNzbError::FileAttribute moved from position 4 to 5, in /tmp/.tmpXRjgIx/nzb-rs/src/errors.rs:41
  ParseNzbError::XmlSyntax moved from position 5 to 6, in /tmp/.tmpXRjgIx/nzb-rs/src/errors.rs:48

Changelog

0.6.0 - 2025-08-21

Fixed

• use .start() instead of .range()
• refactor stem and extension extractor
• more robust extension and stem parser
• implement a basic "natsort" for Nzb.files
• ensure nzb has atleast one non-par2 file

Other

• (deps) bump taiki-e/install-action in the actions group (#40)
• (deps) bump the actions group with 2 updates (#42)
• enable rust-toolchain updates in dependabot

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This PR was generated with release-plz.