add 1.9, 1.10, 1.11 to CI, and rm 1.4 on macOS

[ericphanson]

as mentioned in #27

[ericphanson]

hm, old macos is failing, probably since they switched the runners to apple silicon

[rfourquet]

I added 1.10 and 1.11. We could also probably ditch support for version older than 1.10.

[rfourquet]

MacOS fails consistenly on 1.4, cf. for example https://github.com/JuliaRandom/StableRNGs.jl/actions/runs/19209002554/job/54908411048?pr=28, where the Run julia-actions/setup-julia@v2 action fails:

Warning: [setup-julia] x64 arch has been requested on a macOS runner that has an arm64 (Apple Silicon) architecture. You may have meant to use the "aarch64" arch instead (or left it unspecified for the correct default).
/usr/bin/tar xf /Users/runner/work/_temp/0275a4c8-1743-4d13-bb7a-065c57152206 --strip-components=1 -C /Users/runner/hostedtoolcache/julia/1.4.2/x64
/Users/runner/hostedtoolcache/julia/1.4.2/x64/bin/julia --version
dyld[3248]: Library not loaded: @rpath/libc++.1.dylib
  Referenced from: <9D95F589-ECFA-3689-84C3-B3846F44FADE> /Users/runner/hostedtoolcache/julia/1.4.2/x64/lib/julia/libLLVM.dylib
  Reason: tried: '/Users/runner/hostedtoolcache/julia/1.4.2/x64/lib/julia/../lib/libc++.1.dylib' (no such file), '/Users/runner/hostedtoolcache/julia/1.4.2/x64/lib/julia/libc++.1.dylib' (no such file), '/Users/runner/hostedtoolcache/julia/1.4.2/x64/lib/libc++.1.dylib' (no such file), '/Users/runner/hostedtoolcache/julia/1.4.2/x64/lib/libc++.1.dylib' (no such file), '/Users/runner/hostedtoolcache/julia/1.4.2/x64/lib/libc++.1.dylib' (no such file)
Error: The process '/Users/runner/hostedtoolcache/julia/1.4.2/x64/bin/julia' failed with exit code null

I will disable it.