Generate a nonce per request, for example:
MjYwMzM5NzQwMywxMjE1Njc5Njg3
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MjYwMzM5NzQwMywxMjE1Njc5Njg3'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MjYwMzM5NzQwMywxMjE1Njc5Njg3" src="https://static.addtoany.com/menu/page.js"></script>