Bump mandatory LLVM version to 16 (emscripten-core#10)

Author: directhex

tools/shared.py

@@ -49,7 +49,7 @@
 # exact requirement, but is the oldest version of node that we do any testing with.
 # This version aligns with the current Ubuuntu TLS 20.04 (Focal).
 MINIMUM_NODE_VERSION = (10, 19, 0)
-EXPECTED_LLVM_VERSION = 14
+EXPECTED_LLVM_VERSION = 16
 
 # Used only when EM_PYTHON_MULTIPROCESSING=1 env. var is set.
 multiprocessing_pool = None