Generate a nonce per request, for example:
NDEwMDMyMzk4OCw2ODg3NDc3NDg=
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-NDEwMDMyMzk4OCw2ODg3NDc3NDg='
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="NDEwMDMyMzk4OCw2ODg3NDc3NDg=" src="https://static.addtoany.com/menu/page.js"></script>