Tune up lints for 1.83 Rust

- upgrade `thiserror` crate from 1.0.20 to 2.0 version

Author: tyranron

Diff for: Cargo.toml

@@ -29,7 +29,7 @@ parser = ["dep:typed-builder"]
 [dependencies]
 peg = "0.6.3"
 textwrap = "0.16"
-thiserror = "1.0.20"
+thiserror = "2.0"
 
 # "parser" feature dependencies.
 typed-builder = { version = "0.20", optional = true }

Diff for: src/keywords.rs

@@ -129,7 +129,7 @@ impl<'a> Keywords<'a> {
     }
 }
 
-impl<'a> Default for Keywords<'a> {
+impl Default for Keywords<'_> {
     fn default() -> Self {
         EN
     }