Drop Requires.jl dependency and use native Julia v1.10 extensions

- Remove Requires.jl from dependencies in Project.toml
- Update Julia compat to require v1.10 (new LTS)
- Remove conditional extension loading code from src/Adapt.jl
- Simplify extension modules to use standard imports
- Update CI to test only Julia v1.10 and newer

Julia v1.10 is now the LTS release, so we can drop support for older
versions and remove the Requires.jl compatibility layer.

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

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

Author: ChrisRackauckas

.github/workflows/Test.yml

@@ -13,10 +13,6 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.6'
-          - '1.7'
-          - '1.8'
-          - '1.9'
           - '1.10'
           - '1.11'
           - 'nightly'

Project.toml

@@ -4,7 +4,6 @@ version = "4.4.0"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
-Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 
 [weakdeps]
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
@@ -15,9 +14,8 @@ AdaptSparseArraysExt = "SparseArrays"
 AdaptStaticArraysExt = "StaticArrays"
 
 [compat]
-Requires = "1"
 StaticArrays = "1"
-julia = "1.6"
+julia = "1.10"
 LinearAlgebra = "1"
 SparseArrays = "1"
 

ext/AdaptSparseArraysExt.jl

@@ -1,7 +1,7 @@
 module AdaptSparseArraysExt
 
 using Adapt
-isdefined(Base, :get_extension) ? (using SparseArrays) : (using ..SparseArrays)
+using SparseArrays
 
 Adapt.adapt_storage(::Type{Array}, xs::SparseVector) = xs
 Adapt.adapt_storage(::Type{Array}, xs::SparseMatrixCSC) = xs

ext/AdaptStaticArraysExt.jl

@@ -1,7 +1,7 @@
 module AdaptStaticArraysExt
 
 using Adapt
-isdefined(Base, :get_extension) ? (using StaticArrays) : (using ..StaticArrays)
+using StaticArrays
 
 Adapt.adapt_storage(::Type{<:SArray{S}}, xs::Array) where {S} = SArray{S}(xs)
 Adapt.adapt_storage(::Type{SArray}, xs::Array) = SArray{Tuple{size(xs)...}}(xs)

src/Adapt.jl

@@ -67,19 +67,5 @@ include("arrays.jl")
 # helpers
 include("macro.jl")
 
-if !isdefined(Base, :get_extension)
-using Requires
-end
-
-@static if !isdefined(Base, :get_extension)
-function __init__()
-    @require SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf" begin
-        include("../ext/AdaptSparseArraysExt.jl")
-    end
-    @require StaticArrays = "90137ffa-7385-5640-81b9-e52037218182" begin
-        include("../ext/AdaptStaticArraysExt.jl")
-    end
-end
-end
 
 end # module