chore: update C++ builder to latest functions framework
chore: update C++ builder to latest functions framework

PiperOrigin-RevId: 435619014
Change-Id: I5c2acaac3ea30cf31bbc6f80e89b75d38dd64b11

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