Update plugin to point to main branch after merge (#247)

* update

* point at specific commmit on main

index.html

@@ -5,7 +5,7 @@
   <meta http-equiv='Content-Type' content='text/html;charset=utf-8'/>
   <title>Securing Verifiable Credentials using JOSE and COSE</title>
   <script src="https://www.w3.org/Tools/respec/respec-w3c" class="remove"></script>
-  <script src="https://cdn.jsdelivr.net/gh/w3c/vc-jose-cose@89b1ff2cbafcb80b731aeb62fd5c1351a7ab595a/plugin/dist/main.js"></script>
+  <script src="https://cdn.jsdelivr.net/gh/w3c/vc-jose-cose@9d5dd4da28866b42ecb074f4ed35d308b4b89374/plugin/dist/main.js"></script>
   <script class="remove">
     // See https://github.com/w3c/respec/wiki/ for how to configure
     // ReSpec