Remove deprecated lazy loading for extensions

Removed lazy loading of chainrules for Julia < 1.9 and related Requires imports.

Author: amontoison

src/LinearOperators.jl

@@ -27,32 +27,4 @@ include("TimedOperators.jl")
 include("utilities.jl")
 include("deprecated.jl")
 
-# lazy loading of chainrules for Julia < 1.9
-@static if !isdefined(Base, :get_extension)
-  import Requires
-end
-
-@static if !isdefined(Base, :get_extension)
-  function __init__()
-    Requires.@require AMDGPU = "21141c5a-9bdb-4563-92ae-f87d6854732e" begin
-      include("../ext/LinearOperatorsAMDGPUExt.jl")
-    end
-    Requires.@require ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4" begin
-      include("../ext/LinearOperatorsChainRulesCoreExt.jl")
-    end
-    Requires.@require CUDA = "052768ef-5323-5732-b1bb-66c8b64840ba" begin
-      include("../ext/LinearOperatorsCUDAExt.jl")
-    end
-    Requires.@require LDLFactorizations = "40e66cde-538c-5869-a4ad-c39174c6795b" begin
-      include("../ext/LinearOperatorsLDLFactorizationsExt.jl")
-    end
-    Requires.@require JLArrays = "27aeb0d3-9eb9-45fb-866b-73c2ecf80fcb" begin
-      include("../ext/LinearOperatorsJLArraysExt.jl")
-    end
-    Requires.@require Metal = "dde4c033-4e86-420c-a63e-0dd931031962" begin
-      include("../ext/LinearOperatorsMetalExt.jl")
-    end
-  end
-end
-
 end # module