Bump Flux in tests too to test the new Optimisers version

Author: Vaibhavdixit02

test/Project.toml

@@ -32,11 +32,11 @@ Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 Aqua = "0.8"
 ComponentArrays = ">= 0.13.9"
 DiffEqFlux = ">= 2"
-Flux = "0.13, 0.14"
+Flux = "0.13, 0.14, 0.15"
 IterTools = ">= 1.3.0"
 Lux = ">= 0.4.50"
 Optim = ">= 1.4.1"
 Optimisers = ">= 0.2.5"
 OrdinaryDiffEq = ">= 5"
 SafeTestsets = ">= 0.0.1"
-SciMLSensitivity = ">= 7.0.0"
+SciMLSensitivity = ">= 7.0.0"