TLS `caCertificates` not working

**Describe the bug**

Attempting to connect to database with these options fail with error: "The certificate used to secure the TLS connection is invalid: Bad resource ID"

```
tls: {
enforce: true, // Set this to false if using localhost
caCertificates: [await Deno.readTextFile('./pg-server-ca.pem')],
},
```

However, this simple connection test succeeds:
```
const conn = await Deno.connectTls({
hostname: Deno.env.get('PG_HOST'),
port: 5432,
caCerts: [await Deno.readTextFile("pg-server-ca.pem")],
});
```

**To Reproduce**
Try the code/steps above.

**Expected behavior**
PG should connect, but it does not.