text_cop: update `cargo build` cop

Library/Homebrew/rubocops/text_cop.rb

@@ -55,7 +55,7 @@ module RuboCop
           end
 
           find_method_with_args(body_node, :system, "cargo", "build") do
-            problem "use \"cargo\", \"install\", \"--root\", prefix"
+            problem "use \"cargo\", \"install\", \"--root\", prefix, \"--path\", \".\""
           end
         end
       end

Library/Homebrew/test/rubocops/text_cop_spec.rb

@@ -200,7 +200,7 @@ describe RuboCop::Cop::FormulaAudit::Text do
 
           def install
             system "cargo", "build"
-            ^^^^^^^^^^^^^^^^^^^^^^^ use \"cargo\", \"install\", \"--root\", prefix
+            ^^^^^^^^^^^^^^^^^^^^^^^ use \"cargo\", \"install\", \"--root\", prefix, \"--path\", \".\"
           end
         end
       RUBY