[Bugfix] Fix unsupported FA version check for Turing GPU (vllm-project#12828)

Author: Isotr0py

vllm/attention/backends/utils.py

@@ -612,5 +612,5 @@ def flash_attn_version():
         return fa_version
 
     VLLM_FLASH_ATTN_VERSION = flash_attn_version()
-except ImportError:
+except (ImportError, AssertionError):
     VLLM_FLASH_ATTN_VERSION = None