chore(ci): fix macos conan cache

Author: qqiangwu

.github/workflows/ci-macos.yml

@@ -46,7 +46,7 @@ jobs:
       uses: actions/cache/restore@v3
       with:
         path: ~/.conan2/p/
-        key: ${{ runner.os }}-${{ runner.arch }}-cppsafe-conan-${{ env.LLVM_VERSION }}
+        key: ${{ matrix.os }}-${{ runner.arch }}-cppsafe-conan-${{ env.LLVM_VERSION }}
 
     - name: Install llvm
       working-directory: conan