upgrade macos runner to macos-14 (#17)

Author: shenxianpeng

.github/workflows/build-amd64.yml

@@ -51,7 +51,7 @@ jobs:
             dotexe: ''
             shacmd: 'sha512sum'
           - os: macosx
-            runner: macos-11
+            runner: macos-14
             os-cmake-args: '-DCMAKE_CXX_FLAGS="-static-libgcc -static-libstdc++ -flto" -DCMAKE_OSX_DEPLOYMENT_TARGET=11 ${POSIX_CMAKE_ARGS}'
             build-args: '-j$(sysctl -n hw.ncpu)'
             bindir: '/build/bin'