Evaluated macro condition errors when SQL IN operator has array length 1

[treysp]

For evaluated macro conditions (like those in @IF, body macros like @WHEN), the IN operator errors when the comparison array is length 1.

Works: 1 in (1,2)
Errors: 1 in (1)

from sqlglot import parse_one
from sqlmesh.core.macros import MacroEvaluator

query = "@IF(1 in (1,2), a, b)"
MacroEvaluator().transform(parse_one(query)).sql()
# 'a'

query = "@IF(1 in (1), a, b)"
MacroEvaluator().transform(parse_one(query)).sql()
# TypeError: argument of type 'int' is not iterable
# sqlmesh.utils.errors.MacroEvalError: Error trying to eval macro.
# Generated code: 1 in (1)
# Original sql: 1 IN (1)

[georgesittas]

This should be fixed when we bump SQLGlot.