chore: update version of mermaid to 10.9.1 (gogs#7760)

Author: kulak

public/plugins/mermaid-10.9.1/mermaid.min.js

@@ -59,7 +59,7 @@
 	<script src="{{AppSubURL}}/plugins/autosize-4.0.2/autosize.min.js"></script>
 {{end}}
 {{if .IsMarkdown}}
-	<script src="{{AppSubURL}}/plugins/mermaid-8.14.0/mermaid.min.js"></script>
+	<script src="{{AppSubURL}}/plugins/mermaid-10.9.1/mermaid.min.js"></script>
 	<script>
 		$(document).ready(function () {
 			mermaid.init({startOnLoad: true, noteMargin: 10}, ".language-mermaid");