Hello,
I have checked your site and the favicon already has the mentioned attributes http://prntscr.com/uh25hv
So, try to follow the Google instructions https://support.google.com/webmasters/answer/9290858?hl=en and request indexing of your site’s homepage https://support.google.com/webmasters/answer/6065812
3. Google will look for and update your favicon whenever it crawls your home page. If you make changes to your favicon and want to inform Google about the changes, you can request indexing of your site’s homepage. Updates can take a few days or longer to appear in search results.
Regards