Generate a nonce per request, for example:
Mjc4MjY4NTc5NywyNjU3ODc5Nzg1
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-Mjc4MjY4NTc5NywyNjU3ODc5Nzg1'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="Mjc4MjY4NTc5NywyNjU3ODc5Nzg1" src="https://static.addtoany.com/menu/page.js"></script>