docs: Update examples to use pgx/v5

Author: andrewmbenton

examples/authors/postgresql/db.go

@@ -15,6 +15,7 @@ sql:
   gen:
     go:
       package: authors
+      sql_package: pgx/v5
       out: postgresql
 - schema: mysql/schema.sql
   queries: mysql/query.sql
@@ -45,4 +46,4 @@ rules:
   rule: "postgresql.explain.plan.total_cost > 300.0"
 - name: mysql-query-too-costly
   message: "Too costly"
-  rule: "has(mysql.explain.query_block.cost_info) && double(mysql.explain.query_block.cost_info.query_cost) > 2.0"
+  rule: "has(mysql.explain.query_block.cost_info) && double(mysql.explain.query_block.cost_info.query_cost) > 2.0"

examples/authors/postgresql/models.go

@@ -19,7 +19,7 @@
       "rules": [
         "sqlc/db-prepare"
       ],
-      "sql_package": "pgx/v4",
+      "sql_package": "pgx/v5",
       "emit_json_tags": true,
       "emit_prepared_queries": true,
       "emit_interface": true