don't test KernelGradients on nightly for now (#292)

Author: vchuravy

.ci/develop.jl

@@ -22,7 +22,9 @@ if !CI || BACKEND == "CUDA"
     Pkg.develop(cudakernels)
 end
 
-kernelgradients = Pkg.PackageSpec(path = joinpath(root_directory, "lib", "KernelGradients"))
-Pkg.develop(kernelgradients)
+if VERSION < v"1.8"
+    kernelgradients = Pkg.PackageSpec(path = joinpath(root_directory, "lib", "KernelGradients"))
+    Pkg.develop(kernelgradients)
+end
 Pkg.build()
 Pkg.precompile()

.ci/test.jl

@@ -13,7 +13,9 @@ if !CI || BACKEND == "CUDA"
     push!(pkgs, "CUDAKernels")
 end
 if !CI || haskey(ENV, "TEST_KERNELGRADIENTS")
-    push!(pkgs, "KernelGradients")
+    if VERSION < v"1.8"
+        push!(pkgs, "KernelGradients")
+    end
 end
 
 Pkg.test(pkgs; coverage = true)