clap: Remove #[arg(value_parser)] which is now the default

Fixes these warnings when running `cargo check --features clap/deprecated`:
warning: use of deprecated function `<Opts as clap::Args>::augment_args::bare_value_parser`: `#[arg(value_parser)]` is now the default and is no longer needed`
   --> src/main.rs:146:9
    |
146 |         value_parser
    |         ^^^^^^^^^^^^
    |
    = note: `#[warn(deprecated)]` on by default

warning: use of deprecated function `<Opts as clap::Args>::augment_args::bare_value_parser`: `#[arg(value_parser)]` is now the default and is no longer needed`
   --> src/main.rs:179:9
    |
179 |         value_parser
    |         ^^^^^^^^^^^^

Author: LingMan

src/main.rs

@@ -142,8 +142,7 @@ struct Opts {
     #[arg(
         help = "Arguments to pass to cargo or the file specified by --script during tests",
         num_args = 1..,
-        last = true,
-        value_parser
+        last = true
     )]
     command_args: Vec<OsString>,
 
@@ -173,11 +172,7 @@ a date (YYYY-MM-DD), git tag name (e.g. 1.58.0) or git commit SHA."
     #[arg(long, help = "Force installation over existing artifacts")]
     force_install: bool,
 
-    #[arg(
-        long,
-        help = "Script replacement for `cargo build` command",
-        value_parser
-    )]
+    #[arg(long, help = "Script replacement for `cargo build` command")]
     script: Option<PathBuf>,
 
     #[arg(long, help = "Do not install cargo [default: install cargo]")]