Generate a nonce per request, for example:
MzUwMTg1ODY3MSwyNjEyODAyODEz
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MzUwMTg1ODY3MSwyNjEyODAyODEz'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MzUwMTg1ODY3MSwyNjEyODAyODEz" src="https://static.addtoany.com/menu/page.js"></script>