Generate a nonce per request, for example:
MjgwMTU2OTE2OSwxNjg1MDk0NTMz
Include the nonce in your strict CSP:
Content-Security-Policy: script-src 'nonce-MjgwMTU2OTE2OSwxNjg1MDk0NTMz'
Add the nonce attribute to your AddToAny <script> tag like so:
<script async nonce="MjgwMTU2OTE2OSwxNjg1MDk0NTMz" src="https://static.addtoany.com/menu/page.js"></script>