Remove Python version flag from test case

Author: hyperkai

test-data/unit/check-type-aliases.test

@@ -1238,7 +1238,6 @@ Ta2 = TypeAliasType("Ta2", None, type_params=(Unpack[Ts],))  # E: Free type vari
 [builtins fixtures/tuple.pyi]
 
 [case testGenericTypeAliasArgOfTypeAliasIsUnpackedTuple]
-# flags: --python-version 3.10
 from typing_extensions import TypeAlias
 from typing import TypeVarTuple, Unpack