Generate a nonce per request, for example:
NDE3MjQ4MzUzNSwxODk3MTI3NzE0
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-NDE3MjQ4MzUzNSwxODk3MTI3NzE0'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="NDE3MjQ4MzUzNSwxODk3MTI3NzE0" src="https://static.addtoany.com/menu/page.js"></script>