fix(gravatar-image): update link to https

Author: bmeurant

index.html

@@ -11,7 +11,7 @@
     <meta name="author" content="Baptiste Meurant <baptiste.meurant@gmail.com>">
     <meta name="url" content="https://bmeurant.github.io">
 
-    <link rel="icon" type="image/png" href="http://www.gravatar.com/avatar/c28e672be1580d9cb3dc6f7dc7f370c4.png">
+    <link rel="icon" type="image/png" href="https://www.gravatar.com/avatar/c28e672be1580d9cb3dc6f7dc7f370c4.png">
 
     <script src="https://kit.fontawesome.com/d26f36e1f3.js" crossorigin="anonymous"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/i18next/23.7.7/i18next.min.js"></script>