TestRedirects: Shut down client when done

This saves about five seconds per test case, which works out to 20
seconds across the entire test suite.

Author: rschmitt

httpclient5-testing/src/test/java/org/apache/hc/client5/testing/sync/TestRedirects.java

@@ -810,6 +810,7 @@ void testCrossSiteRedirectWithSensitiveHeadersAndLaxRedirectStrategy(final Strin
             final RedirectLocations redirects = context.getRedirectLocations();
             Assertions.assertNotNull(redirects);
             Assertions.assertEquals(1, redirects.size());
+            client.close();
         } finally {
             secondServer.shutdown(CloseMode.GRACEFUL);
         }