[Core] Require xgrammar >= 0.1.6 (vllm-project#11021)

Signed-off-by: Russell Bryant <[email protected]>

requirements-common.txt

@@ -19,7 +19,7 @@ prometheus-fastapi-instrumentator >= 7.0.0
 tiktoken >= 0.6.0  # Required for DBRX tokenizer
 lm-format-enforcer >= 0.10.9, < 0.11
 outlines >= 0.0.43, < 0.1
-xgrammar >= 0.1.5; platform_machine == "x86_64"
+xgrammar >= 0.1.6; platform_machine == "x86_64"
 typing_extensions >= 4.10
 filelock >= 3.16.1 # need to contain https://github.com/tox-dev/filelock/pull/317
 partial-json-parser # used for parsing partial JSON outputs