fix(FN-3808): increase create-room member role typography

- Increase the member role text sizing in CreateRoomModal for better readability
- Update CreateRoomModal.css with the adjusted typography value
- Keep the change scoped to create-room role styling only

Fusion-Task-Id: FN-3808

plugins/fusion-plugin-roadmap/src/store/__tests__/roadmap-store.test.ts

@@ -744,7 +744,7 @@ describe("RoadmapStore", () => {
 
   describe("schema version", () => {
     it("schema version is 40 after init", () => {
-      expect(db.getSchemaVersion()).toBe(69);
+      expect(db.getSchemaVersion()).toBe(70);
     });
   });