Generate a nonce per request, for example:
NDA3NzAwODQ5MCwxNjc5ODM1OTYx
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-NDA3NzAwODQ5MCwxNjc5ODM1OTYx'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="NDA3NzAwODQ5MCwxNjc5ODM1OTYx" src="https://static.addtoany.com/menu/page.js"></script>