update font import statement with weights

scipost_django/scipost/static/scipost/assets/css/_general.scss

@@ -2,7 +2,7 @@
 General style sheet for SciPost
 */
 
-@import url(https://fonts.googleapis.com/css?family=Merriweather+Sans:wght@100,400;500;600&display=swap);
+@import url('https://fonts.googleapis.com/css2?family=Merriweather+Sans:ital,wght@0,300..800;1,300..800&display=swap');
 
 .bi {
     vertical-align: -.125em;