[core] Fix Tidelift reference

Author: oliviertassinari

.github/FUNDING.yml

@@ -4,5 +4,5 @@ github: # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, u
 patreon: # Replace with a single Patreon username
 open_collective: mui-org
 ko_fi: # Replace with a single Ko-fi username
-tidelift: npm/@mui/material
+tidelift: npm/@pigment-css/react
 custom: # Replace with a single custom sponsorship URL