pgjdbc: Adjust test for updates to conn.getMetaData().getCatalogs()

As before, the inquiry of the available catalogs returned `doc` on the
first slot.

It looks actually correct now in 42.7, as `doc` is the schema, but not
the catalog. The SQL statement to inquire the available catalogs returns
`crate`, not `doc`.

  SELECT DISTINCT table_catalog FROM information_schema.tables 

This item on the upstream release notes seems to be relevant:

  feat: return all catalogs for getCatalogs metadata query closes
  ISSUE #2949 PR #2953

  -- https://jdbc.postgresql.org/changelogs/2023-11-20-42.7.0-release/

tests/client_tests/stock_jdbc/src/test/java/stock_jdbc/JdbcMetaDataTest.java

@@ -121,7 +121,8 @@ public void test_getCatalogs() throws Exception {
         try (var conn = DriverManager.getConnection(URL)) {
             var result = conn.getMetaData().getCatalogs();
             assertThat(result.next(), is(true));
-            assertThat(result.getString(1), is("doc"));
+            // Returns `crate` as of pgjdbc 42.7.0. It returned `doc` before.
+            assertThat(result.getString(1), is("crate"));
         }
     }