abc notation requirement update

Update foot.ejs
abc notation requirement update
the bass fingering will conflict with each other if there is more than one fingering annotation.

example

```abc
`X:1
T:Simple Scale
M:4/4
L:1/4
K:C
"_1" "_2" C D E F|G A B c|]`
```

Author: Matt-V50

public/views/codimd/foot.ejs

@@ -20,7 +20,7 @@
 <script src="https://cdnjs.cloudflare.com/ajax/libs/viz.js/2.1.2/viz.js" integrity="sha256-8RHyK+AFzq9iXwbFo2unqidwPbwHU5FFWe3RwkcVtuU=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/viz.js/2.1.2/full.render.js" integrity="sha256-Ogqs510LFnekr9o7OLdpelaaAmNss9egQRTyzCqV2NQ=" crossorigin="anonymous" defer></script>
 
-<script src="https://cdnjs.cloudflare.com/ajax/libs/abcjs/3.1.1/abcjs_basic-min.js" integrity="sha256-Sq1r2XXWXQoShQKsS0Wrf5r7fRkErd9Fat9vHYeU68s=" crossorigin="anonymous" defer></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/abcjs/6.2.3/abcjs_basic-min.js" integrity="sha256-Sq1r2XXWXQoShQKsS0Wrf5r7fRkErd9Fat9vHYeU68s=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/vega/5.17.1/vega.min.js" integrity="sha512-VaNhWxxm7c02xaYMBd8FTS1V89mnFLopQ2/ClJkrSmh421NROVQNJMqeL5KnwpFW14POUzFIzEIETV/5SAbH/Q==" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/vega-lite/4.17.0/vega-lite.min.js" integrity="sha512-GUsnbKvdacPXIFZvHFFFnWEulYU74fanU2z9aie8g3/F/xcX9vxZuQFLwv9NjdV261fxj9SyAJ3Cf65jvYWMxw==" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/vega-embed/6.14.2/vega-embed.min.js" integrity="sha512-Nhf4uoYFL/Mu9UESXLF9Mo22qmhuWEhAQWHAZOHpNntSvtzjsg5dWn8PBQN6l573WPNWgL6F7VwzTY9Y+l+RPg==" crossorigin="anonymous" defer></script>