Generate a nonce per request, for example:
MzY5Mjk1MDU1OCwxMjA0MzgwODEw
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MzY5Mjk1MDU1OCwxMjA0MzgwODEw'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MzY5Mjk1MDU1OCwxMjA0MzgwODEw" src="https://static.addtoany.com/menu/page.js"></script>