Update TestValidation/Homogeneous_Aggregate_Validation_test_9

[polds]

TestValidation/Homogeneous_Aggregate_Validation_test_9 is broken. We should fix or remove.

=== RUN   TestValidation/Homogeneous_Aggregate_Validation_test_9
    eval_test.go:359: Compile() got error = a map key must be a quoted string, a number, a identifier, or an expression enclosed in parentheses (unexpected token Operator("?")) (1:2)
         | {?'hello': optional.ofNonZeroValue(false), 'world': true}
         | .^, wantErr false
    --- FAIL: TestValidation/Homogeneous_Aggregate_Validation_test_9 (0.00s)