build: bump SII compat

Author: AayushSabharwal

Project.toml

@@ -160,7 +160,7 @@ SpecialFunctions = "0.7, 0.8, 0.9, 0.10, 1.0, 2"
 StaticArrays = "0.10, 0.11, 0.12, 1.0"
 StochasticDelayDiffEq = "1.10"
 StochasticDiffEq = "6.72.1"
-SymbolicIndexingInterface = "0.3.39"
+SymbolicIndexingInterface = "0.3.42"
 SymbolicUtils = "3.26.1"
 Symbolics = "6.40"
 URIs = "1"