Fixed macOS GHA build (openvinotoolkit#26431)

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Author: ilya-lavrenov

.github/workflows/mac.yml

@@ -69,7 +69,7 @@ jobs:
     env:
       CMAKE_BUILD_TYPE: 'Release'
       CMAKE_GENERATOR: 'Ninja Multi-Config'
-      MACOSX_DEPLOYMENT_TARGET: '10.12'
+      MACOSX_DEPLOYMENT_TARGET: '10.15'
       CMAKE_CXX_COMPILER_LAUNCHER: ccache
       CMAKE_C_COMPILER_LAUNCHER: ccache
       OPENVINO_REPO: ${{ github.workspace }}/openvino