workflows: improve macOS workflow

Use scripts/mac-toolchain-build hash as the toolchain cache key, so it will be updated automatically.
Fix meson build failure.

.github/workflows/mac.yml

@@ -11,39 +11,43 @@ jobs:
     name: Build on macOS
     runs-on: macos-14
     env:
-      DEVELOPER_DIR: /Applications/Xcode_15.2.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_15.3.app/Contents/Developer
     steps:
     - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
+      with:
+        python-version: '3.12.3'
 
     - name: Toolchain Cache
-      id: mac-toolchain-arm
+      id: mac-toolchain
       uses: actions/cache@v4
       with:
         path: ~/mac-toolchain
-        key: mac-toolchain-arm
+        key: ${{ runner.os }}-${{ runner.arch }}-toolchain-${{ hashFiles('**/scripts/mac-toolchain-build') }}
 
     - name: Cargo-C Toolchain Cache
-      id: mac-cargo-c-toolchain-arm
+      id: mac-cargo-c-toolchain
       uses: actions/cache@v4
       with:
         path: |
           ~/.cargo/bin/cargo-capi
           ~/.cargo/bin/cargo-cbuild
           ~/.cargo/bin/cargo-cinstall
-        key: mac-cargo-c-toolchain-arm
+        key: ${{ runner.os }}-${{ runner.arch }}-cargo-c-toolchain
 
     - name: Setup Environment
       run: |
         echo ~/mac-toolchain/bin >> $GITHUB_PATH
         rustup target add x86_64-apple-darwin
 
     - name: Setup Toolchain
-      if: steps.mac-toolchain-arm.outputs.cache-hit != 'true'
+      if: steps.mac-toolchain.outputs.cache-hit != 'true'
       run: |
+        pip install setuptools
         scripts/mac-toolchain-build ~/mac-toolchain
 
     - name: Setup Cargo-C Toolchain
-      if: steps.mac-cargo-c-toolchain-arm.outputs.cache-hit != 'true'
+      if: steps.mac-cargo-c-toolchain.outputs.cache-hit != 'true'
       run: |
         cargo install cargo-c