Generate a nonce per request, for example:
MjQ4OTI4MTQsMjAzMTUyNjIwOA==
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MjQ4OTI4MTQsMjAzMTUyNjIwOA=='
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MjQ4OTI4MTQsMjAzMTUyNjIwOA==" src="https://static.addtoany.com/menu/page.js"></script>