Update dependency highlight.js to v10.7.3

Author: renovate-bot

public/index.html

@@ -8,7 +8,7 @@
 		<meta name="viewport" content="width=device-width, initial-scale=1.0">
 		<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
 		<link rel="stylesheet" href="style.css">
-		<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.6.0/styles/github.min.css">	
+		<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.7.3/styles/github.min.css">	
 		<link rel="stylesheet" href="https://unpkg.com/primer@latest/build/build.css"/>
 		<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/github-markdown-css/4.0.0/github-markdown.min.css">
 		<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>