Update branding to 8.0.21#63509

wtgodbe merged 1 commit intodotnet:release/8.0dotnet/aspnetcore:release/8.0from

vseanreesermsft:branding-8.0.21-2025-09-02-0938-b38b318b-7b09-44b9-82e7-518f5ee28bb1vseanreesermsft/aspnetcore:branding-8.0.21-2025-09-02-0938-b38b318b-7b09-44b9-82e7-518f5ee28bb1Copy head branch name to clipboard