Generate a nonce per request, for example:
MTkzMjA0MjU5MCw0MjE0ODU4MTEw
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MTkzMjA0MjU5MCw0MjE0ODU4MTEw'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MTkzMjA0MjU5MCw0MjE0ODU4MTEw" src="https://static.addtoany.com/menu/page.js"></script>