Remove Requires.jl (#2999)

This should not be required now that our minimum supported version is 1.10,
which has package extension support.

Author: JamesWrigley

Project.toml

@@ -32,7 +32,6 @@ Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Random123 = "74087812-796a-5b5d-8853-05524746bad3"
 RandomNumbers = "e6cf234a-135c-5ec9-84dd-332b85af5143"
 Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
-Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
@@ -82,7 +81,6 @@ Random = "1"
 Random123 = "1.2"
 RandomNumbers = "1.5.3"
 Reexport = "1.0"
-Requires = "1.0"
 SparseArrays = "1"
 SparseMatricesCSR = "0.6.9"
 SpecialFunctions = "1.3, 2"

src/CUDA.jl

@@ -14,8 +14,6 @@ import KernelAbstractions
 
 using Adapt: Adapt, adapt, WrappedArray
 
-using Requires: @require
-
 using LinearAlgebra
 
 using BFloat16s: BFloat16

src/initialization.jl

@@ -171,18 +171,6 @@ function __init__()
                  Please consider using an official build from https://julialang.org/downloads/."""
     end
 
-    @static if !isdefined(Base, :get_extension)
-        @require ChainRulesCore="d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4" begin
-            include("../ext/ChainRulesCoreExt.jl")
-        end
-        @require SpecialFunctions="276daf66-3868-5448-9aa4-cd146d93841b" begin
-            include("../ext/SpecialFunctionsExt.jl")
-        end
-        @require EnzymeCore = "f151be2c-9106-41f4-ab19-57ee4f262869" begin
-            include("../ext/EnzymeCoreExt.jl")
-        end
-    end
-
     # enable generation of FMA instructions to mimic behavior of nvcc
     LLVM.clopts("-nvptx-fma-level=1")