build: bump SII compat for Downgrade CI

Author: AayushSabharwal

Project.toml

@@ -59,7 +59,7 @@ StaticArrays = "1.6"
 StaticArraysCore = "1.4"
 Statistics = "1.10"
 StructArrays = "0.6.11"
-SymbolicIndexingInterface = "0.3.19"
+SymbolicIndexingInterface = "0.3.20"
 Tables = "1.11"
 Test = "1"
 Tracker = "0.2.15"