Remove outdated Julia version checks

Remove version checks for Julia v1.8 and v1.9 since the minimum supported
version is Julia v1.10. These conditional branches are always true and
no longer needed.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: claude

test/interface/norecompile.jl

@@ -28,12 +28,10 @@ t4 = @elapsed sol4 = solve(lorenzprob2, Rosenbrock23(autodiff = AutoFiniteDiff()
 @test sol3.retcode === ReturnCode.Success
 @test sol4.retcode === ReturnCode.Success
 
-if VERSION >= v"1.8"
-    @test t1 < t3
-    @test t2 < t4
-    integ = init(lorenzprob, Rosenbrock23())
-    @test integ.f.f isa FunctionWrappersWrappers.FunctionWrappersWrapper
-end
+@test t1 < t3
+@test t2 < t4
+integ = init(lorenzprob, Rosenbrock23())
+@test integ.f.f isa FunctionWrappersWrappers.FunctionWrappersWrapper
 
 solve(prob, EPIRK4s3A(), dt = 1e-1)
 

test/interface/sized_matrix_tests.jl

@@ -14,23 +14,21 @@ p_giesekus = [η0, τ, α]
 
 prob_giesekus = ODEProblem(dudt!, σ0, (0.0, 2.0), p_giesekus)
 
-if VERSION >= v"1.9"
-    solve_giesekus = solve(prob_giesekus, Rodas4(), saveat = 0.2, abstol = 1e-14,
-        reltol = 1e-14)
-    for alg in [
-        Rosenbrock23(),
-        Rodas4(),
-        Rodas4P(),
-        Rodas5(),
-        Rodas5P(),
-        Tsit5(),
-        Vern6(),
-        Vern7(),
-        Vern8(),
-        Vern9(),
-        DP5()
-    ]
-        sol = solve(prob_giesekus, alg, saveat = 0.2, abstol = 1e-14, reltol = 1e-14)
-        @test Array(sol) ≈ Array(solve_giesekus)
-    end
+solve_giesekus = solve(prob_giesekus, Rodas4(), saveat = 0.2, abstol = 1e-14,
+    reltol = 1e-14)
+for alg in [
+    Rosenbrock23(),
+    Rodas4(),
+    Rodas4P(),
+    Rodas5(),
+    Rodas5P(),
+    Tsit5(),
+    Vern6(),
+    Vern7(),
+    Vern8(),
+    Vern9(),
+    DP5()
+]
+    sol = solve(prob_giesekus, alg, saveat = 0.2, abstol = 1e-14, reltol = 1e-14)
+    @test Array(sol) ≈ Array(solve_giesekus)
 end