Bumpd again the maximum llama-stack version supported

This is needed so that when doing make build-images it can takes
up to the latest code in llama-stack directory

Author: luis5tb

src/constants.py

@@ -2,7 +2,7 @@
 
 # Minimal and maximal supported Llama Stack version
 MINIMAL_SUPPORTED_LLAMA_STACK_VERSION = "0.2.17"
-MAXIMAL_SUPPORTED_LLAMA_STACK_VERSION = "0.2.21"
+MAXIMAL_SUPPORTED_LLAMA_STACK_VERSION = "0.2.22"
 
 UNABLE_TO_PROCESS_RESPONSE = "Unable to process this request"