minor fixes to homebrew formula so it passes strict audit checks

Author: mvp

Formula/uhubctl.rb

@@ -1,13 +1,13 @@
 class Uhubctl < Formula
  desc "USB hub per-port power control"
  homepage "https://github.com/mvp/uhubctl"
- head "https://github.com/mvp/uhubctl.git"
- url "https://github.com/mvp/uhubctl/archive/v2.6.0.tar.gz"
+ url "https://github.com/mvp/uhubctl/archive/refs/tags/v2.6.0.tar.gz"
+ head "https://github.com/mvp/uhubctl.git", branch: "master"
  sha256 "56ca15ddf96d39ab0bf8ee12d3daca13cea45af01bcd5a9732ffcc01664fdfa2"
- license "GPL-2.0"
+ license "GPL-2.0-only"
 
- depends_on "libusb"
  depends_on "pkg-config" => :build
+ depends_on "libusb"
 
  livecheck do
  url :stable
@@ -19,6 +19,6 @@ def install
  end
 
  test do
- system "#{bin}/uhubctl", "-v"
+ system bin/"uhubctl", "-v"
  end
 end