Handle \restrict/\unrestrict in PostgreSQL 17.6 pg_dump output (#716)

Same as #704 

PostgreSQL 17.6 added \restrict and \unrestrict commands to pg_dump
output as a security measure for CVE-2025-8714. This breaks tests that
expect exact string matching between the "PostgreSQL database dump
complete" comment and the "Dbmate schema migrations" section.

Split the assertion into two separate require.Contains calls to allow
any content between these sections.

See https://www.postgresql.org/docs/17/release-17-6.html and
https://www.postgresql.org/support/security/CVE-2025-8714/

Co-authored-by: Cursor Agent <[email protected]>

Author: sofuture

pkg/driver/postgres/postgres_test.go

@@ -228,9 +228,8 @@ func TestPostgresDumpSchema(t *testing.T) {
 		require.Contains(t, string(schema), "CREATE TABLE public.schema_migrations")
 		require.Contains(t, string(schema), "\n--\n"+
 			"-- PostgreSQL database dump complete\n"+
-			"--\n\n\n"+
-			"--\n"+
-			"-- Dbmate schema migrations\n"+
+			"--\n\n")
+		require.Contains(t, string(schema), "-- Dbmate schema migrations\n"+
 			"--\n\n"+
 			"INSERT INTO public.schema_migrations (version) VALUES\n"+
 			"    ('abc1'),\n"+
@@ -266,9 +265,8 @@ func TestPostgresDumpSchema(t *testing.T) {
 		require.Contains(t, string(schema), "CREATE TABLE \"camelSchema\".\"testMigrations\"")
 		require.Contains(t, string(schema), "\n--\n"+
 			"-- PostgreSQL database dump complete\n"+
-			"--\n\n\n"+
-			"--\n"+
-			"-- Dbmate schema migrations\n"+
+			"--\n\n")
+		require.Contains(t, string(schema), "-- Dbmate schema migrations\n"+
 			"--\n\n"+
 			"INSERT INTO \"camelSchema\".\"testMigrations\" (version) VALUES\n"+
 			"    ('abc1'),\n"+