build: bump SymbolicUtils compat

Author: AayushSabharwal

Project.toml

@@ -150,7 +150,7 @@ StaticArrays = "0.10, 0.11, 0.12, 1.0"
 StochasticDelayDiffEq = "1.8.1"
 StochasticDiffEq = "6.72.1"
 SymbolicIndexingInterface = "0.3.39"
-SymbolicUtils = "3.25.1"
+SymbolicUtils = "3.26.1"
 Symbolics = "6.37"
 URIs = "1"
 UnPack = "0.1, 1.0"