use date-tagged setup-ci action, add arm64 link to readme

Author: lkeegan

.github/workflows/release.yml

@@ -32,7 +32,7 @@ jobs:
     env:
       LLVM_TARGETS_TO_BUILD: ${{ matrix.LLVM_TARGETS_TO_BUILD }}
     steps:
-      - uses: spatial-model-editor/setup-ci@v1
+      - uses: spatial-model-editor/setup-ci@2024.04.23
       - uses: actions/checkout@v4
       - name: Build script
         run: ./build.sh

README.md

@@ -6,4 +6,5 @@ Get the latest versions here:
 
 - linux (clang 18 / Ubuntu 20.04): [sme_deps_llvm_linux.tgz](https://github.com/spatial-model-editor/sme_deps_llvm/releases/latest/download/sme_deps_llvm_linux.tgz)
 - osx (Xcode 14.3 / macOS 13): [sme_deps_llvm_osx.tgz](https://github.com/spatial-model-editor/sme_deps_llvm/releases/latest/download/sme_deps_llvm_osx.tgz)
+- osx-arm64 (Xcode 15.3 / macOS 14): [sme_deps_llvm_osx-arm64.tgz](https://github.com/spatial-model-editor/sme_deps_llvm/releases/latest/download/sme_deps_llvm_osx-arm64.tgz)
 - win64-mingw (mingw-w64-x86_64-gcc 13): [sme_deps_llvm_win64-mingw.tgz](https://github.com/spatial-model-editor/sme_deps_llvm/releases/latest/download/sme_deps_llvm_win64-mingw.tgz)