title: Update key of object inside array of objects in jsonb column
body: <p>I have a <code>jsonb</code> column called <code>data</code>. It is deeply nested and there's a key which's value is an array of objects:</p>
  
  <pre><code>select data#&gt;&gt;'{foo,bar,baz,qux}' from my_table limit 1;
  -------------
  ?column? | [{"a": 1, "b:": 2}, {"a": 3, "b": 4}, {"a": 5, "b_": 6}]
  </code></pre>
  
  <p>As you see, there are different forms of <code>"b"</code> key.</p>
  
  <p>My goal is to update all rows with <code>"b:"</code> and <code>"b_"</code> keys and set them to <code>"b"</code>.</p>