Use latest CmdStan

Resolves a build failure on new XCode versions

Author: WardBrian

python/setup.py

@@ -20,7 +20,7 @@
 MODEL_DIR = "stan"
 MODEL_TARGET_DIR = os.path.join("prophet", "stan_model")
 
-CMDSTAN_VERSION = "2.33.1"
+CMDSTAN_VERSION = "2.37.0"
 BINARIES_DIR = "bin"
 BINARIES = ["diagnose", "print", "stanc", "stansummary"]
 TBB_PARENT = "stan/lib/stan_math/lib"