Generate a nonce per request, for example:
MTc1OTgyOTQ2NywxMTA5NzA4Njcx
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MTc1OTgyOTQ2NywxMTA5NzA4Njcx'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MTc1OTgyOTQ2NywxMTA5NzA4Njcx" src="https://static.addtoany.com/menu/page.js"></script>