Generate a nonce per request, for example:
MjQzMzEwMzA0MSw1NzEzODg0ODg=
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MjQzMzEwMzA0MSw1NzEzODg0ODg='
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MjQzMzEwMzA0MSw1NzEzODg0ODg=" src="https://static.addtoany.com/menu/page.js"></script>