Generate a nonce per request, for example:
MzQ5MTQxODI3OSwyNTgzNDA5ODM2
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MzQ5MTQxODI3OSwyNTgzNDA5ODM2'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MzQ5MTQxODI3OSwyNTgzNDA5ODM2" src="https://static.addtoany.com/menu/page.js"></script>