Generate a nonce per request, for example:
MzY4MTY5ODgzOSwyODM4MjI0ODY3
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MzY4MTY5ODgzOSwyODM4MjI0ODY3'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MzY4MTY5ODgzOSwyODM4MjI0ODY3" src="https://static.addtoany.com/menu/page.js"></script>