Generate a nonce per request, for example:
MjI4MTY3MDI1OCwzMDU0OTIxOTQ=
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MjI4MTY3MDI1OCwzMDU0OTIxOTQ='
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MjI4MTY3MDI1OCwzMDU0OTIxOTQ=" src="https://static.addtoany.com/menu/page.js"></script>