Generate a nonce per request, for example:
MTMzNTEzODc4OSwzNDgxODQ3NTM=
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MTMzNTEzODc4OSwzNDgxODQ3NTM='
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MTMzNTEzODc4OSwzNDgxODQ3NTM=" src="https://static.addtoany.com/menu/page.js"></script>