Update Homebrew TAP formula: flow-php to version: 0.20.0 (#1758)

<h2>Change Log</h2>
<div id="change-log">
  <h4>Changed</h4>
  <ul id="changed">
    <li>Update Homebrew TAP formula: flow-php to version: 0.20.0</li>
  </ul>
</div>
<hr/>

<h2>Description</h2>

Created by https://github.com/mislav/bump-homebrew-formula-action

Author: norberttech

src/tools/homebrew/Formula/flow-php.rb

@@ -1,8 +1,8 @@
 class FlowPhp < Formula
   desc "Flow is a first and the most advanced PHP ETL framework"
   homepage "https://github.com/flow-php/flow"
-  url "https://github.com/flow-php/flow/releases/download/0.19.0/flow.phar"
-  sha256 "d23561e34577d2711b3a03daecc2c94fa3e34c81c2a3d8b91931dbec6e08a1a6"
+  url "https://github.com/flow-php/flow/releases/download/0.20.0/flow.phar"
+  sha256 "7262fe8b69bda6616371eb2481addb7c4dcbd2aa244d0d444f0b70e5332cd9d5"
   license "MIT"
 
   depends_on "php"