Generate a nonce per request, for example:
MzI4NjAzODc3Myw0MDk2NzI0NTY2
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MzI4NjAzODc3Myw0MDk2NzI0NTY2'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MzI4NjAzODc3Myw0MDk2NzI0NTY2" src="https://static.addtoany.com/menu/page.js"></script>