Generate a nonce per request, for example:
MjQwNjY5OTA5MSwyMDM3MjM3OTA1
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MjQwNjY5OTA5MSwyMDM3MjM3OTA1'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MjQwNjY5OTA5MSwyMDM3MjM3OTA1" src="https://static.addtoany.com/menu/page.js"></script>