Fix clap deprecation warnings

crates/fj-app/src/args.rs

@@ -7,22 +7,22 @@ use fj_math::Scalar;
 
 /// Fornjot - Experimental CAD System
 #[derive(clap::Parser)]
-#[clap(version = env!("FJ_VERSION_STRING"))]
+#[command(version = env!("FJ_VERSION_STRING"))]
 pub struct Args {
     /// The model to open
-    #[clap(short, long)]
+    #[arg(short, long)]
     pub model: Option<PathBuf>,
 
     /// Export model to this path
-    #[clap(short, long)]
+    #[arg(short, long)]
     pub export: Option<PathBuf>,
 
     /// Parameters for the model, each in the form `key=value`
-    #[clap(short, long, value_parser = parse_parameters)]
+    #[arg(short, long, value_parser = parse_parameters)]
     pub parameters: Option<Parameters>,
 
     /// Model deviation tolerance
-    #[clap(short, long, value_parser = parse_tolerance)]
+    #[arg(short, long, value_parser = parse_tolerance)]
     pub tolerance: Option<Tolerance>,
 }