Boolean array type inference error

Boolean array, always passed as a boolean value, here is an example:
```JS
await sql`SELECT ${[false, true]} AS bool_array`
// Result(1) [ { bool_array: false } ]
```
this query is throwing an error
```JS
await sql`SELECT ${[true, false]}::bool[]`;
// Error cannot cast type boolean to boolean[]
```
I think this PR solves this problem
https://github.com/porsager/postgres/pull/392