update min az cli version

Author: dsmith111

src/index.json

@@ -21291,7 +21291,7 @@
                 "downloadUrl": "https://github.com/Azure/azure-baremetalinfrastructure-cli-extension/releases/download/2.0.1/baremetal_infrastructure-2.0.1-py2.py3-none-any.whl",
                 "filename": "baremetal_infrastructure-2.0.1-py2.py3-none-any.whl",
                 "metadata": {
-                    "azext.minCliCoreVersion": "2.54.0",
+                    "azext.minCliCoreVersion": "2.56.0",
                     "classifiers": [
                         "Development Status :: 4 - Beta",
                         "Intended Audience :: Developers",