fix: vcpkg binary cache for C++ builder
fix: vcpkg binary cache for C++ builder

PiperOrigin-RevId: 393117154
Change-Id: I30632914e8f364f3d9dea867d64a4b12ebd1b7ae

GoogleCloudPlatform/buildpacks,GoogleCloudPlatform/buildpacks,GoogleCloudPlatform/buildpacks,GoogleCloudPlatform/buildpacks