Generate a nonce per request, for example:
MTg0MzUxMjUxNywxMjk1MjI4MTEz
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MTg0MzUxMjUxNywxMjk1MjI4MTEz'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MTg0MzUxMjUxNywxMjk1MjI4MTEz" src="https://static.addtoany.com/menu/page.js"></script>