Generate a nonce per request, for example:
NTU3ODY5MjEyLDM1OTQ1ODkzMTI=
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-NTU3ODY5MjEyLDM1OTQ1ODkzMTI='
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="NTU3ODY5MjEyLDM1OTQ1ODkzMTI=" src="https://static.addtoany.com/menu/page.js"></script>