Update CodeMirror dep to v5.42.2

Affects Code and Markdown section types

gui/public/codemirror/mode/css/less.html

@@ -10,7 +10,7 @@
 <script src="css.js"></script>
 <style>.CodeMirror {border: 1px solid #ddd; line-height: 1.2;}</style>
 <div id=nav>
-  <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
+  <a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
 
   <ul>
     <li><a href="../../index.html">Home</a>
@@ -140,8 +140,8 @@ fieldset span button, fieldset span input[type="file"] {
 </textarea></form>
     <script>
       var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
-        lineNumbers : true,
-        matchBrackets : true,
+        lineNumbers: true,
+        matchBrackets: true,
         mode: "text/x-less"
       });
     </script>