Update realtime_mixin.dart.twig

Author: lohanidamodar

templates/flutter/lib/src/realtime_mixin.dart.twig

@@ -120,12 +120,13 @@ mixin RealtimeMixin {
   }
 
   int _getTimeout() {
-    return switch (_retries) {
-      < 5 => 1,
-      < 15 => 5,
-      < 100 => 10,
-      _ => 60,
-    };
+    return _retries < 5
+        ? 1
+        : _retries < 15
+            ? 5
+            : _retries < 100
+                ? 10
+                : 60;
   }
 
   Uri _prepareUri() {