Generate a nonce per request, for example:
Mzk5NjM3MzczMCwyMDI1NTc4ODA4
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-Mzk5NjM3MzczMCwyMDI1NTc4ODA4'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="Mzk5NjM3MzczMCwyMDI1NTc4ODA4" src="https://static.addtoany.com/menu/page.js"></script>