set correct fpm sock

templates/nginx.cfg

@@ -12,7 +12,7 @@ server {
 
 	location ~ \.php$ {
 		include snippets/fastcgi-php.conf;
-		fastcgi_pass unix:/var/run/php/php-fpm.sock;
+		fastcgi_pass unix:/var/run/php/php7.3-fpm.sock;
 	}
 
 	# Rewrite the old path yyyy/mm/dd/ to /images/